Fixed a null reference exception that could occur while calculating event hashcodes

Author: niemyjski

src/Exceptionless/Extensions/CollectionEqualityExtensions.cs

@@ -75,7 +75,7 @@ public static int GetCollectionHashCode<TValue>(this IDictionary<string, TValue>
                 var item = source[key];
                 unchecked {
                     var kvpHash = key.GetHashCode();
-                    kvpHash = (kvpHash * 397) ^ item.GetHashCode();
+                    kvpHash = (kvpHash * 397) ^ (item == null ? 0 : item.GetHashCode());
                     keyValuePairHashes.Add(kvpHash);
                 }
             }

src/Exceptionless/Extensions/ToErrorModelExtensions.cs

@@ -78,7 +78,11 @@ private static Error ToErrorModelInternal(Exception exception, ExceptionlessClie
                         if (String.IsNullOrEmpty(key) || key.AnyWildcardMatches(exclusions, true))
                             continue;
 
-                        error.Data[key] = exception.Data[k];
+                        var item = exception.Data[k];
+                        if (item == null)
+                            continue;
+
+                        error.Data[key] = item;
                     }
                 }
             } catch (Exception ex) {

src/Exceptionless/Extensions/ToSimpleErrorModelExtensions.cs

@@ -42,7 +42,11 @@ public static SimpleError ToSimpleErrorModel(this Exception exception, Exception
                         if (String.IsNullOrEmpty(key) || key.AnyWildcardMatches(exclusions, true))
                             continue;
 
-                        error.Data[key] = exception.Data[k];
+                        var item = exception.Data[k];
+                        if (item == null)
+                            continue;
+
+                        error.Data[key] = item;
                     }
                 }
             } catch (Exception ex) {