diff --git a/src/strings.cpp b/src/strings.cpp
index 393f45f114..8db7262153 100644
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -116,12 +116,12 @@ static const char *GetStringPtr(StringID string)
  */
 static char *GetStringWithArgs(char *buffr, uint string, const int64 *argv, const char* last)
 {
+	if (GB(string, 0, 16) == 0) return GetStringWithArgs(buffr, STR_UNDEFINED, argv, last);
+
 	uint index = GB(string,  0, 11);
 	uint tab   = GB(string, 11,  5);
 	char buff[512];
 
-	if (GB(string, 0, 16) == 0) error("!invalid string id 0 in GetString");
-
 	switch (tab) {
 		case 4:
 			if (index >= 0xC0)