Got to read the assembly to really know what happened. E.g. if the architecture has pointers with non-address bits (modes or segments or whatever) and those bi

Got to read the assembly to really know what happened. E.g. if the architecture has pointers with non-address bits (modes or segments or whatever) and those bits were set yet the rest of the address was 'null', and the check was for 'all bits zero' then you could conceivably get that situation.