--- files/patch-std-string-compat-c-int-source-funcs.inc	(revision 0)
+++ files/patch-std-string-compat-c-int-source-funcs.inc	(working copy)
@@ -0,0 +1,11 @@ 
+--- src/c-int-source-funcs.inc.orig
++++ src/c-int-source-funcs.inc
+@@ -157,7 +157,7 @@ std::string GetMapValue(std::map<std::string,std::string> Map, int Item)
+ 		if (o) \
+ 		{ \
+ 			try { \
+-				((MusicBrainz5::C##TYPE1 *)o)->Set##PROP1(str); \
++				((MusicBrainz5::C##TYPE1 *)o)->Set##PROP1(str ? str : ""); \
+ 			} \
+ 			catch (...) { \
+ 			} \