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diff --git a/grammar.c b/grammar.c
index 3595578..26444f8 100644
--- a/grammar.c
+++ b/grammar.c
@@ -1084,9 +1084,7 @@ void libconfig_yyerror(void *scanner, struct parse_context *ctx,
YYUSE (scanner);
YYUSE (ctx);
YYUSE (scan_ctx);
- if (!yymsg)
- yymsg = "Deleting";
- YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
+ YY_SYMBOL_PRINT (yymsg != NULL ? yymsg : "Deleting", yytype, yyvaluep, yylocationp);
YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
YYUSE (yytype);
diff --git a/scanner.c b/scanner.c
index 60882db..8b8af33 100644
--- a/scanner.c
+++ b/scanner.c
@@ -21,6 +21,7 @@
#include <string.h>
#include <errno.h>
#include <stdlib.h>
+#include <assert.h>
/* end standard C headers. */
@@ -1702,6 +1703,8 @@ static int yy_get_next_buffer (yyscan_t yyscanner)
yy_create_buffer( yyin, YY_BUF_SIZE , yyscanner);
}
+ assert(YY_CURRENT_BUFFER != NULL); // Fixes compiler warning -Wnull-dereference on gcc-6 and -O3
+
yy_init_buffer( YY_CURRENT_BUFFER, input_file , yyscanner);
yy_load_buffer_state( yyscanner );
}
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