From 0f1b12688ddc7f29c6325d0236c4123316bfb2ff Mon Sep 17 00:00:00 2001
From: sbh <sergey.belash@opencascade.com>
Date: Thu, 23 Apr 2015 14:04:22 +0300
Subject: [PATCH] Fix for crash on clearing of the parameter name field

---
 src/ParametersPlugin/ParametersPlugin_Validators.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ParametersPlugin/ParametersPlugin_Validators.cpp b/src/ParametersPlugin/ParametersPlugin_Validators.cpp
index 788e16398..d15102d64 100644
--- a/src/ParametersPlugin/ParametersPlugin_Validators.cpp
+++ b/src/ParametersPlugin/ParametersPlugin_Validators.cpp
@@ -29,6 +29,8 @@ bool ParametersPlugin_VariableValidator::isValid(const AttributePtr& theAttribut
 
 bool ParametersPlugin_VariableValidator::isVariable(const std::string& theString) const
 {
+  if (theString.empty())
+    return false;
   std::string::const_iterator it = theString.begin();
   if (!(isalpha(*it) || (*it) == '_') || it == theString.end())
     return false;
-- 
2.39.2