Fix calltip crash due to the division by zero #195

Job	Run time
build_windows_cmake (Release, x64, amd64)	3m 42s
build_windows_msys2 (Release, x86_64)	5m 57s
build_windows (Release, x64)	3m 58s
build_windows_msys2 (Release, i686)	5m 34s
build_windows (Release, Win32)	3m 7s
build_windows_msys2 (Debug, x86_64)	5m 19s
build_windows (Release, ARM64)	3m 32s
build_windows_msys2 (Debug, i686)	4m 4s
build_windows (Debug, x64)	6m 35s
build_windows (Debug, Win32)	4m 13s
build_windows (Debug, ARM64)	3m 14s
	49m 15s

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