diff --git a/ParserTools/ParserTools/BaseLanguageIntellisenseSupport.cs b/ParserTools/ParserTools/BaseLanguageIntellisenseSupport.cs
index 3b017c7cf..5e4b85145 100644
--- a/ParserTools/ParserTools/BaseLanguageIntellisenseSupport.cs
+++ b/ParserTools/ParserTools/BaseLanguageIntellisenseSupport.cs
@@ -1980,6 +1980,9 @@ namespace PascalABCCompiler.Parsers
                 i++;
             }
 
+            if (count > 0)
+                return -1;
+
             return i;
         }
 
diff --git a/VisualPascalABCNET/DS/CodeCompletionVisual/TipPainterTools.cs b/VisualPascalABCNET/DS/CodeCompletionVisual/TipPainterTools.cs
index 3115a640e..7eea30340 100644
--- a/VisualPascalABCNET/DS/CodeCompletionVisual/TipPainterTools.cs
+++ b/VisualPascalABCNET/DS/CodeCompletionVisual/TipPainterTools.cs
@@ -121,6 +121,10 @@ namespace ICSharpCode.TextEditor.Util
                                 {
                                     int paramDelimLength = languageIntellisenseSupport.ParameterDelimiter.Length;
 
+                                    // Проверка на всякий случай, чтобы не возникало ошибки с отрицательным length в Substring  EVA
+                                    if (paranthesisIndex - paramDelimLength < paramDelimLength)
+                                        return;
+
                                     string paramDescription = descriptionAfterBracket.Substring(paramDelimIndex + paramDelimLength, paranthesisIndex - paramDelimIndex - paramDelimLength);
 
                                     if (languageIntellisenseSupport.IsParams(paramDescription))
diff --git a/VisualPascalABCNETLinux/DS/CodeCompletionVisual/TipPainterTools.cs b/VisualPascalABCNETLinux/DS/CodeCompletionVisual/TipPainterTools.cs
index bbf7e3794..377e916be 100644
--- a/VisualPascalABCNETLinux/DS/CodeCompletionVisual/TipPainterTools.cs
+++ b/VisualPascalABCNETLinux/DS/CodeCompletionVisual/TipPainterTools.cs
@@ -120,6 +120,10 @@ namespace ICSharpCode.TextEditor.Util
                                 {
                                     int paramDelimLength = languageIntellisenseSupport.ParameterDelimiter.Length;
 
+                                    // Проверка на всякий случай, чтобы не возникало ошибки с отрицательным length в Substring  EVA
+                                    if (paranthesisIndex - paramDelimLength < paramDelimLength)
+                                        return;
+
                                     string paramDescription = descriptionAfterBracket.Substring(paramDelimIndex + paramDelimLength, paranthesisIndex - paramDelimIndex - paramDelimLength);
 
                                     if (languageIntellisenseSupport.IsParams(paramDescription))