diff -Naupr mdsplib-0.11.orig/src/dcdmtrmk.c mdsplib-0.11/src/dcdmtrmk.c --- mdsplib-0.11.orig/src/dcdmtrmk.c 2003-12-10 22:28:15.000000000 +0100 +++ mdsplib-0.11/src/dcdmtrmk.c 2009-06-11 12:00:39.887533211 +0200 @@ -1987,11 +1987,11 @@ MDSP_BOOL static isLTGfreq( char **strin } else { + (--string); + if( *string == NULL ) return FALSE; - (--string); - LTG_FREQ_FLAG = FALSE; /*-- CHECK FOR LIGHTNING FREQUENCY -----------*/