Index: src/runtime/exception.m
==================================================================
--- src/runtime/exception.m
+++ src/runtime/exception.m
@@ -414,10 +414,11 @@
 		displacement = (intptr_t)read_sleb128(&ptr);
 		actionrecords += displacement;
 
 		if (filter > 0 && !(actions & _UA_FORCE_UNWIND) && !foreign) {
 			Class class;
+			const char *className;
 			uintptr_t c;
 			const uint8_t *tmp;
 
 #if defined(__arm__) || defined(__ARM__)
 			tmp = lsda->typestable - (filter * 4);
@@ -435,12 +436,14 @@
 			c = (uintptr_t)read_value(lsda->typestable_enc, &tmp);
 			c = (uintptr_t)resolve_value(c, lsda->typestable_enc,
 			    lsda->typestable - i, lsda->typestable_base);
 #endif
 
-			if (c != 0)
-				class = objc_getRequiredClass((const char*)c);
+			className = (const char*)c;
+
+			if (className != NULL && *className != '\0')
+				class = objc_getRequiredClass(className);
 			else
 				class = Nil;
 
 			if (class_matches(class, e->object)) {
 				*filtervalue = filter;