lib-var-expand: Do not clobber error in var_expand_parser_error()

diff --git a/src/lib-var-expand/var-expand-lexer.l b/src/lib-var-expand/var-expand-lexer.l
index 29e884ed9b1bed1babb51e9a3e940797b421308e..4465589b7b26e3bc3e0c31613fe7f95d6e853b9d 100644 (file)
--- a/src/lib-var-expand/var-expand-lexer.l
+++ b/src/lib-var-expand/var-expand-lexer.l
@@ -132,7 +132,8 @@ extern void var_expand_parser_error(YYLTYPE *loc, YYSTYPE *state, const char *er
 void var_expand_parser_error(YYLTYPE *loc ATTR_UNUSED, YYSTYPE *state, const char *error)
 {
        state->failed = TRUE;
-       state->error = p_strdup(state->pool, error);
+       if (state->error == NULL)
+               state->error = p_strdup(state->pool, error);
 }
 
 static int scanner_error(void *scanner, const char *msg)