diff -up libproxy-0.4.11/libproxy/extension_pacrunner.cpp.mozjscrash libproxy-0.4.11/libproxy/extension_pacrunner.cpp
--- libproxy-0.4.11/libproxy/extension_pacrunner.cpp.mozjscrash	2010-07-29 08:14:59.000000000 -0400
+++ libproxy-0.4.11/libproxy/extension_pacrunner.cpp	2013-09-19 09:22:13.031263766 -0400
@@ -35,6 +35,7 @@ pacrunner* pacrunner_extension::get(stri
 		if (this->last == pac)
 			return this->pr;
 		delete this->pr;
+		this->pr = NULL;
 	}
 
 	return this->pr = this->create(pac, pacurl);
diff -up libproxy-0.4.11/libproxy/modules/pacrunner_mozjs.cpp.mozjscrash libproxy-0.4.11/libproxy/modules/pacrunner_mozjs.cpp