diff --git a/kjs/regexp.cpp b/kjs/regexp.cpp
index a693fdc1a..c92a69d6a 100644
--- a/kjs/regexp.cpp
+++ b/kjs/regexp.cpp
@@ -149,6 +149,7 @@ RegExp::RegExp(const UString &p, int f)
     pcre2_get_error_message(errorCode, errorMsg, sizeof(errorMsg));
     fprintf(stderr, "KJS: pcre_compile() failed with '%s'\n", errorMsg);
 #endif
+    match_data = nullptr;
     valid = false;
     return;
   }