From c09660785d7d4088c1f90f17d31b03650798d9d9 Mon Sep 17 00:00:00 2001
From: Laurents Meyer <laucomm@gmail.com>
Date: Wed, 3 Nov 2021 01:53:26 +0100
Subject: [PATCH] Fix ArgumentNullException when creating a database. (#107)

---
 .../JetStoreDatabaseHandling.cs               | 21 +++++++++++--------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/EFCore.Jet.Data/JetStoreSchemaDefinition/JetStoreDatabaseHandling.cs b/src/EFCore.Jet.Data/JetStoreSchemaDefinition/JetStoreDatabaseHandling.cs
index a34163f..6a3137a 100644
--- a/src/EFCore.Jet.Data/JetStoreSchemaDefinition/JetStoreDatabaseHandling.cs
+++ b/src/EFCore.Jet.Data/JetStoreSchemaDefinition/JetStoreDatabaseHandling.cs
@@ -175,18 +175,21 @@ namespace EntityFrameworkCore.Jet.Data.JetStoreSchemaDefinition
 
         public static string ExtractFileNameFromConnectionString(string connectionString)
         {
-            var match = _regExExtractFilenameFromConnectionString.Match(connectionString);
-            if (match.Success)
+            if (connectionString != null)
             {
-                var fileName = match.Groups["filename"].Value;
-
-                if (match.Groups["quote"].Success)
+                var match = _regExExtractFilenameFromConnectionString.Match(connectionString);
+                if (match.Success)
                 {
-                    var quoteChar = match.Groups["quote"].Value;
-                    fileName = fileName.Replace(quoteChar + quoteChar, quoteChar);
-                }
+                    var fileName = match.Groups["filename"].Value;
+
+                    if (match.Groups["quote"].Success)
+                    {
+                        var quoteChar = match.Groups["quote"].Value;
+                        fileName = fileName.Replace(quoteChar + quoteChar, quoteChar);
+                    }
 
-                return fileName;
+                    return fileName;
+                }
             }
 
             return connectionString;