Debugging in Clion: "Attempt to take address of value not located in memory" with &&

Hi. I'm using the "Evaluate Expression" window in Clion. When in a breakpoint I put in the expression legs[0] != 0 && true (legs is a vector which contains two elements.) and it evaluates to true as I'd expect, but if I put in true && legs[0] != 0 (the conditions are swapped round) then it gives me the error "Attempt to take address of value not located in memory.". To me these seem like they should be the same. I'm using Clion 2016.3. Any ideas what I'm doing wrong?

Patrick.