Fixes after 698c708bf6

src/ifcparse/IfcParse.cpp

@@ -748,18 +748,21 @@ size_t IfcParse::IfcFile::load(unsigned entity_instance_name, const IfcParse::en
 	}
 
 	if (vector) {
-		// @todo figure out whether all this logic is still necessary, since we know the
-		// expected amount of attributes and shouldn't be able to access more than allowed
-		// by the schema.
-		attributes = new Argument*[(std::max)(num_attributes, vector->size())]{ nullptr };
-		
-		// @todo this appears unnecessary, we increment this in the loop already,
-		// which is more accurate as the filler can't go above it's size in case
-		// it uses the pre-allocated c-array.
-		// -> return_value = vector->size();
+		// Obviously don't try and create a 0-length array.
+		if (num_attributes || vector->size()) {
+			// @todo figure out whether all this logic is still necessary, since we know the
+			// expected amount of attributes and shouldn't be able to access more than allowed
+			// by the schema.
+			attributes = new Argument*[(std::max)(num_attributes, vector->size())]{ nullptr };
 
-		for (size_t i = 0; i < vector->size(); ++i) {
-			attributes[i] = vector->at(i);
+			// @todo this appears unnecessary, we increment this in the loop already,
+			// which is more accurate as the filler can't go above it's size in case
+			// it uses the pre-allocated c-array.
+			// -> return_value = vector->size();
+
+			for (size_t i = 0; i < vector->size(); ++i) {
+				attributes[i] = vector->at(i);
+			}
 		}
 
 		if ((vector != &internal_attribute_vector_) && (vector != &internal_attribute_vector_simple_type_)) {