1 files changed, 6 insertions, 6 deletions
diff --git a/src/nvim/ex_cmds.c b/src/nvim/ex_cmds.c
index 3e49d7845d..55366842b0 100644
--- a/src/nvim/ex_cmds.c
+++ b/src/nvim/ex_cmds.c
@@ -3451,13 +3451,13 @@ static buf_T *do_sub(exarg_T *eap, proftime_T timeout,
 
   sub_firstline = NULL;
 
-  /*
-   * ~ in the substitute pattern is replaced with the old pattern.
-   * We do it here once to avoid it to be replaced over and over again.
-   * But don't do it when it starts with "\=", then it's an expression.
-   */
-  if (!(sub[0] == '\\' && sub[1] == '='))
+  // ~ in the substitute pattern is replaced with the old pattern.
+  // We do it here once to avoid it to be replaced over and over again.
+  // But don't do it when it starts with "\=", then it's an expression.
+  assert(sub != NULL);
+  if (!(sub[0] == '\\' && sub[1] == '=')) {
     sub = regtilde(sub, p_magic);
+  }
 
   // Check for a match on each line.
   // If preview: limit to max('cmdwinheight', viewport).