From b2cd3bdb3f9f7c2b8a853ccd892165a1ca9c8cd9 Mon Sep 17 00:00:00 2001
From: Adam Treat <treat.adam@gmail.com>
Date: Fri, 6 Oct 2023 12:44:31 -0400
Subject: [PATCH] Fix crasher with an empty string for prompt template.

---
 gpt4all-chat/chatllm.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gpt4all-chat/chatllm.cpp b/gpt4all-chat/chatllm.cpp
index 9325b763..6a23879d 100644
--- a/gpt4all-chat/chatllm.cpp
+++ b/gpt4all-chat/chatllm.cpp
@@ -423,6 +423,9 @@ std::string trim_whitespace(const std::string& input) {
         return !std::isspace(c);
     });
 
+    if (first_non_whitespace == input.end())
+        return std::string();
+
     auto last_non_whitespace = std::find_if(input.rbegin(), input.rend(), [](unsigned char c) {
         return !std::isspace(c);
     }).base();