diff --git a/lib/check.h b/lib/check.h
index a2bc62cee..f32050227 100644
--- a/lib/check.h
+++ b/lib/check.h
@@ -38,7 +38,7 @@
  * Use CHECK_WRONG_DATA in checkers when you check for wrong data.
  */
 #ifdef DACA2
-#define CHECK_WRONG_DATA(COND, TOK)  ({ if(!(COND)) reportError(TOK,Severity::error,"DacaWrongData","Wrong data detected"); (COND);})
+#define CHECK_WRONG_DATA(COND, TOK)  ({ if(!(COND)) reportError(nullptr,Severity::error,"DacaWrongData","Wrong data detected, " #COND); (COND);})
 #else
 #define CHECK_WRONG_DATA(COND, TOK)  (COND)
 #endif