I found that librtlsdr in github 003bd51167d9680e9721c7296323fdffe4be5a09 can't work with LTE-Cell-Scanner 5fa3df8a5d915c73cacea843021ce0c5b317522f in github.
But librtlsdr release 0.5.2
2d0eaa898d2d4e271aed87ae3849a80ac12cf76c is OK.

The 'can't work' means:

LTE-Cell-Scanner show seg-fault/core-dump when it checks the second frequency point after finishes the first frequency point.
A debug tracing shows that the crash is at rtlsdr_set_center_freq().

BR

Ryan.