This line:
https://github.com/oxfordcontrol/osqp/blob/2aeaebb3a3f8f718e16373caccb0c5a8e091a004/src/osqp.c#L343
will attempt to convert NaN to a c_int in the case that work->settings->check_termination equals zero, which is a valid value according to:
https://github.com/oxfordcontrol/osqp/blob/2aeaebb3a3f8f718e16373caccb0c5a8e091a004/include/types.h#L167

This conversion from NaN to integer is required to trigger an invalid operation exception according to the IEEE 754-2008 standard. On most systems this is silently ignored, but on others, under certain compiler settings, this causes the program to crash.

I was able to work around the issue by wrapping the offending line with if (work->settings->check_termination > 0) {}, but I don't understand the context of the code to know if this is correct.