- (if (equal ,specializer-cache .specializers.)
- (return-from .long-method-combination-function.
- '(error "More than one method of type ~S ~
+ (if (and (equal ,specializer-cache .specializers.)
+ (not (null .specializers.)))
+ (return-from .long-method-combination-function.
+ '(error "More than one method of type ~S ~