gmt math crashes uneccesarily

[PaulWessel]

This script yields SEG for wrong OPERATPR:

echo 1 2 > a.txt
cat << EOF > b.txt
40.712	-74.007
47.562	-52.712
37.742	-25.696
38.776	-9.135
45.503	12.342
EOF
gmt math a.txt b.txt POINT =

ERROR: Caught signal number 11 (Segmentation fault: 11) at
0   libsystem_platform.dylib            0x000000018370a7e8 _platform_memmove + 424
1   ???                                 0x40436353f7ced917 0x0 + 4630654054157965591
Stack backtrace:
0   libgmt.6.5.0.dylib                  0x0000000104d1eb5c gmt_sig_handler_unix + 192
1   libsystem_platform.dylib            0x000000018370aa24 _sigtramp + 56
2   libgmt.6.5.0.dylib                  0x0000000104e0fdd8 gmtmath_load_column + 104
3   libgmt.6.5.0.dylib                  0x0000000104e0acec GMT_gmtmath + 9876
4   libgmt.6.5.0.dylib                  0x0000000104c2460c GMT_Call_Module + 2268
5   libgmt.6.5.0.dylib                  0x0000000104c23eec GMT_Call_Module + 444
6   gmt                                 0x00000001045de4c4 main + 1472
7   dyld                                0x0000000183383f28 start + 2236