diff --git a/src/actions/transformations/base64_decode.cc b/src/actions/transformations/base64_decode.cc
index 0f1d59b1..4c2f9a8f 100644
--- a/src/actions/transformations/base64_decode.cc
+++ b/src/actions/transformations/base64_decode.cc
@@ -40,7 +40,9 @@ std::string Base64Decode::evaluate(std::string value,
     /**
      * @todo Implement the transformation base64decode
      */
-    assay->debug(4, "Transformation 64 is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation 64 is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/base64_decode_ext.cc b/src/actions/transformations/base64_decode_ext.cc
index 97b4bde2..8cccd551 100644
--- a/src/actions/transformations/base64_decode_ext.cc
+++ b/src/actions/transformations/base64_decode_ext.cc
@@ -40,7 +40,10 @@ std::string Base64DecodeExt::evaluate(std::string value,
     /**
      * @todo Implement the transformation Base64DecodeExt
      */
-    assay->debug(4, "Transformation Base64DecodeExt is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation Base64DecodeExt is" \
+            " not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/cmd_line.cc b/src/actions/transformations/cmd_line.cc
index 0deec1a2..4f2f6c8c 100644
--- a/src/actions/transformations/cmd_line.cc
+++ b/src/actions/transformations/cmd_line.cc
@@ -40,7 +40,9 @@ std::string CmdLine::evaluate(std::string value,
     /**
      * @todo Implement the transformation CmdLine
      */
-    assay->debug(4, "Transformation CmdLine is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation CmdLine is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/compress_whitespace.cc b/src/actions/transformations/compress_whitespace.cc
index f9f976f1..6ec0c769 100644
--- a/src/actions/transformations/compress_whitespace.cc
+++ b/src/actions/transformations/compress_whitespace.cc
@@ -40,8 +40,10 @@ std::string CompressWhitespace::evaluate(std::string value,
     /**
      * @todo Implement the transformation CompressWhitespace
      */
-    assay->debug(4, "Transformation CompressWhitespace is " \
-        "not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation CompressWhitespace is " \
+            "not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/escape_seq_decode.cc b/src/actions/transformations/escape_seq_decode.cc
index 588dd70b..3d2ef8e9 100644
--- a/src/actions/transformations/escape_seq_decode.cc
+++ b/src/actions/transformations/escape_seq_decode.cc
@@ -40,7 +40,10 @@ std::string EscapeSeqDecode::evaluate(std::string value,
     /**
      * @todo Implement the transformation EscapeSeqDecode
      */
-    assay->debug(4, "Transformation EscapeSeqDecode is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation EscapeSeqDecode is " \
+            "not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/hex_decode.cc b/src/actions/transformations/hex_decode.cc
index 8c76ce03..742ee2dd 100644
--- a/src/actions/transformations/hex_decode.cc
+++ b/src/actions/transformations/hex_decode.cc
@@ -40,7 +40,9 @@ std::string HexDecode::evaluate(std::string value,
     /**
      * @todo Implement the transformation HexDecode
      */
-    assay->debug(4, "Transformation HexDecode is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation HexDecode is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/hex_encode.cc b/src/actions/transformations/hex_encode.cc
index 3ef3a61f..effc0218 100644
--- a/src/actions/transformations/hex_encode.cc
+++ b/src/actions/transformations/hex_encode.cc
@@ -40,7 +40,9 @@ std::string HexEncode::evaluate(std::string value,
     /**
      * @todo Implement the transformation HexEncode
      */
-    assay->debug(4, "Transformation HexEncode is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation HexEncode is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/length.cc b/src/actions/transformations/length.cc
index d01a3ded..de93e2f5 100644
--- a/src/actions/transformations/length.cc
+++ b/src/actions/transformations/length.cc
@@ -40,7 +40,9 @@ std::string Length::evaluate(std::string value,
     /**
      * @todo Implement the transformation Length
      */
-    assay->debug(4, "Transformation Length is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation Length is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/md5.cc b/src/actions/transformations/md5.cc
index a2b022b3..1ad70fc4 100644
--- a/src/actions/transformations/md5.cc
+++ b/src/actions/transformations/md5.cc
@@ -40,7 +40,9 @@ std::string Md5::evaluate(std::string value,
     /**
      * @todo Implement the transformation Md5
      */
-    assay->debug(4, "Transformation Md5 is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation Md5 is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/normalise_path.cc b/src/actions/transformations/normalise_path.cc
index 430eafb9..aa863a86 100644
--- a/src/actions/transformations/normalise_path.cc
+++ b/src/actions/transformations/normalise_path.cc
@@ -40,7 +40,10 @@ std::string NormalisePath::evaluate(std::string value,
     /**
      * @todo Implement the transformation NormalisePath
      */
-    assay->debug(4, "Transformation NormalisePath is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation NormalisePath is not" \
+        " implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/parity_even_7bit.cc b/src/actions/transformations/parity_even_7bit.cc
index c9b7bea2..59324aa4 100644
--- a/src/actions/transformations/parity_even_7bit.cc
+++ b/src/actions/transformations/parity_even_7bit.cc
@@ -40,7 +40,10 @@ std::string ParityEven7bit::evaluate(std::string value,
     /**
      * @todo Implement the transformation ParityEven7bit
      */
-    assay->debug(4, "Transformation ParityEven7bit is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation ParityEven7bit is not" \
+            " implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/parity_odd_7bit.cc b/src/actions/transformations/parity_odd_7bit.cc
index c34aa9d2..48438a33 100644
--- a/src/actions/transformations/parity_odd_7bit.cc
+++ b/src/actions/transformations/parity_odd_7bit.cc
@@ -40,7 +40,10 @@ std::string ParityOdd7bit::evaluate(std::string value,
     /**
      * @todo Implement the transformation ParityOdd7bit
      */
-    assay->debug(4, "Transformation ParityOdd7bit is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation ParityOdd7bit is not " \
+            "implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/parity_zero_7bit.cc b/src/actions/transformations/parity_zero_7bit.cc
index 05720d41..a3173e29 100644
--- a/src/actions/transformations/parity_zero_7bit.cc
+++ b/src/actions/transformations/parity_zero_7bit.cc
@@ -40,7 +40,10 @@ std::string ParityZero7bit::evaluate(std::string value,
     /**
      * @todo Implement the transformation ParityZero7bit
      */
-    assay->debug(4, "Transformation ParityZero7bit is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation ParityZero7bit is not" \
+            "implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/remove_comments.cc b/src/actions/transformations/remove_comments.cc
index 9f628e64..526cbb8b 100644
--- a/src/actions/transformations/remove_comments.cc
+++ b/src/actions/transformations/remove_comments.cc
@@ -40,8 +40,10 @@ std::string RemoveComments::evaluate(std::string value,
     /**
      * @todo Implement the transformation RemoveComments
      */
-    assay->debug(4, "Transformation RemoveComments is not " \
-        "implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation RemoveComments is not " \
+            "implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/remove_comments_char.cc b/src/actions/transformations/remove_comments_char.cc
index cfd102d0..c23221f9 100644
--- a/src/actions/transformations/remove_comments_char.cc
+++ b/src/actions/transformations/remove_comments_char.cc
@@ -40,8 +40,10 @@ std::string RemoveCommentsChar::evaluate(std::string value,
     /**
      * @todo Implement the transformation RemoveCommentsChar
      */
-    assay->debug(4, "Transformation RemoveCommentsChar " \
-        "is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation RemoveCommentsChar " \
+            "is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/remove_whitespace.cc b/src/actions/transformations/remove_whitespace.cc
index 4aff1dd0..e69262e5 100644
--- a/src/actions/transformations/remove_whitespace.cc
+++ b/src/actions/transformations/remove_whitespace.cc
@@ -40,7 +40,9 @@ std::string RemoveWhitespace::evaluate(std::string value,
     /**
      * @todo Implement the transformation RemoveWhitespace
      */
-    assay->debug(4, "Transformation RemoveWhitespace is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation RemoveWhitespace is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/replace_comments.cc b/src/actions/transformations/replace_comments.cc
index 06d1c6c5..b04cc3b0 100644
--- a/src/actions/transformations/replace_comments.cc
+++ b/src/actions/transformations/replace_comments.cc
@@ -40,7 +40,9 @@ std::string ReplaceComments::evaluate(std::string value,
     /**
      * @todo Implement the transformation ReplaceComments
      */
-    assay->debug(4, "Transformation ReplaceComments is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation ReplaceComments is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/replace_nulls.cc b/src/actions/transformations/replace_nulls.cc
index cd4c7d43..72c5c36b 100644
--- a/src/actions/transformations/replace_nulls.cc
+++ b/src/actions/transformations/replace_nulls.cc
@@ -40,7 +40,9 @@ std::string ReplaceNulls::evaluate(std::string value,
     /**
      * @todo Implement the transformation ReplaceNulls
      */
-    assay->debug(4, "Transformation ReplaceNulls is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation ReplaceNulls is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/sha1.cc b/src/actions/transformations/sha1.cc
index 428830b5..15d25b5b 100644
--- a/src/actions/transformations/sha1.cc
+++ b/src/actions/transformations/sha1.cc
@@ -40,7 +40,9 @@ std::string Sha1::evaluate(std::string value,
     /**
      * @todo Implement the transformation Sha1
      */
-    assay->debug(4, "Transformation Sha1 is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation Sha1 is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/sql_hex_decode.cc b/src/actions/transformations/sql_hex_decode.cc
index 8ec45626..dcf62815 100644
--- a/src/actions/transformations/sql_hex_decode.cc
+++ b/src/actions/transformations/sql_hex_decode.cc
@@ -40,7 +40,9 @@ std::string SqlHexDecode::evaluate(std::string value,
     /**
      * @todo Implement the transformation SqlHexDecode
      */
-    assay->debug(4, "Transformation SqlHexDecode is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation SqlHexDecode is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/url_decode.cc b/src/actions/transformations/url_decode.cc
index 6d1e767b..ee33ea49 100644
--- a/src/actions/transformations/url_decode.cc
+++ b/src/actions/transformations/url_decode.cc
@@ -40,7 +40,9 @@ std::string UrlDecode::evaluate(std::string value,
     /**
      * @todo Implement the transformation UrlDecode
      */
-    assay->debug(4, "Transformation UrlDecode is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation UrlDecode is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/url_encode.cc b/src/actions/transformations/url_encode.cc
index 8bce953c..101e5d97 100644
--- a/src/actions/transformations/url_encode.cc
+++ b/src/actions/transformations/url_encode.cc
@@ -40,7 +40,9 @@ std::string UrlEncode::evaluate(std::string value,
     /**
      * @todo Implement the transformation UrlEncode
      */
-    assay->debug(4, "Transformation UrlEncode is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation UrlEncode is not implemented yet.");
+    }
     return value;
 }
 
diff --git a/src/actions/transformations/utf8_to_unicode.cc b/src/actions/transformations/utf8_to_unicode.cc
index 725c55f7..5c3687ea 100644
--- a/src/actions/transformations/utf8_to_unicode.cc
+++ b/src/actions/transformations/utf8_to_unicode.cc
@@ -40,7 +40,9 @@ std::string Utf8Unicode::evaluate(std::string value,
     /**
      * @todo Implement the transformation Utf8Unicode
      */
-    assay->debug(4, "Transformation Utf8Unicode is not implemented yet.");
+    if (assay) {
+        assay->debug(4, "Transformation Utf8Unicode is not implemented yet.");
+    }
     return value;
 }