diff --git a/lib_jtag_core/src/bsdl_parser/bsdl_loader.c b/lib_jtag_core/src/bsdl_parser/bsdl_loader.c
index 68cf399..cce14e6 100644
--- a/lib_jtag_core/src/bsdl_parser/bsdl_loader.c
+++ b/lib_jtag_core/src/bsdl_parser/bsdl_loader.c
@@ -328,6 +328,9 @@ void preprocess_line(char * line)
 	write_offset = 0;
 	number_of_spaces = 0;
 
+	if(!line)
+		return;
+
 	// first pass : remove extra blank
 	while( line[read_offset] )
 	{