Index: src/OFArray.m
==================================================================
--- src/OFArray.m
+++ src/OFArray.m
@@ -34,11 +34,19 @@
 	return [[[OFBigArray alloc] initWithItemSize: is] autorelease];
 }
 
 - initWithItemSize: (size_t)is
 {
+	Class c;
+
 	self = [super init];
+
+	if (is == 0) {
+		c = isa;
+		[self free];
+		@throw [OFInvalidArgumentException newWithClass: c];
+	}
 
 	data = NULL;
 	itemsize = is;
 	items = 0;