diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
index 75e25fc3a..91d2f4b5d 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
@@ -24,26 +24,29 @@ namespace SqlSugar
             );
             return conditionalExpression;
         }
-        internal static bool IsOwsOne(ExpressionContext context, Expression member)
+        internal static bool IsOwnsOne(ExpressionContext context, Expression member)
         {
-            var isOwsOne = false;
+            var isOwnsOne = false;
+            if (context?.SugarContext?.Context == null) 
+            {
+                return false;
+            }
             if (member is MemberExpression memberExp)
             {
                 var name = memberExp?.Member?.Name;
-                if (memberExp.Expression is MemberExpression parentMemberExp)
+                if (memberExp?.Expression is MemberExpression parentMemberExp)
                 {
-                    if (name != null  && parentMemberExp.Expression is ParameterExpression)
-                    {
-                        var rootExp = (parentMemberExp.Expression as ParameterExpression);
+                    if (name != null  && parentMemberExp?.Expression is ParameterExpression rootExp)
+                    { 
                         var entityInfo = context?.SugarContext?.Context?.EntityMaintenance?.GetEntityInfo(rootExp.Type);
-                        var navColumn = entityInfo.Columns.FirstOrDefault(it => it.PropertyName == name);
-                        isOwsOne = navColumn?.ForOwnsOnePropertyInfo != null;
+                        var navColumn = entityInfo?.Columns?.FirstOrDefault(it => it.PropertyName == name);
+                        isOwnsOne = navColumn?.ForOwnsOnePropertyInfo != null;
                     }
                 }
             }
-            return isOwsOne;
+            return isOwnsOne;
         }
-        internal static EntityColumnInfo GetOwsOneColumnInfo(ExpressionContext context, Expression member)
+        internal static EntityColumnInfo GetOwnsOneColumnInfo(ExpressionContext context, Expression member)
         { 
             EntityColumnInfo entityColumnInfo = new EntityColumnInfo();
             if (member is MemberExpression memberExp)
diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/MemberExpressionResolve.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/MemberExpressionResolve.cs
index 2dc1d0cd7..bf59542d6 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/MemberExpressionResolve.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/MemberExpressionResolve.cs
@@ -457,9 +457,9 @@ namespace SqlSugar
 
         private void ResolveMemberValue(ExpressionParameter parameter, ExpressionParameter baseParameter, bool? isLeft, bool isSetTempData, MemberExpression expression)
         {
-            if (ExpressionTool.IsOwsOne(this.Context, expression)) 
+            if (ExpressionTool.IsOwnsOne(this.Context, expression)) 
             {
-                var column = ExpressionTool.GetOwsOneColumnInfo(this.Context, expression);
+                var column = ExpressionTool.GetOwnsOneColumnInfo(this.Context, expression);
                 var columnName = column.DbColumnName;
                 if (this.Context.IsJoin) 
                 {
diff --git a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
index 2f70c7e98..b149a670f 100644
--- a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
+++ b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>SqlSugarCore</id>
-    <version>5.1.4.141-preview03</version>
+    <version>5.1.4.141-preview05</version>
     <authors>sunkaixuan</authors>
     <owners>果糖大数据科技</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>