diff --git a/res/res_pjproject.c b/res/res_pjproject.c
index c2f7c843d7..16fe01aa48 100644
--- a/res/res_pjproject.c
+++ b/res/res_pjproject.c
@@ -236,7 +236,7 @@ static void capture_buildopts_cb(int level, const char *data, int len)
 	}
 
 	dup = ast_strdup(ast_skip_blanks(data));
-	if (AST_VECTOR_ADD_SORTED(&buildopts, dup, strcmp)) {
+	if (dup && AST_VECTOR_ADD_SORTED(&buildopts, dup, strcmp)) {
 		ast_free(dup);
 	}
 }