diff --git a/src/Parsers/ExpressionElementParsers.cpp b/src/Parsers/ExpressionElementParsers.cpp
index 39e3a0af5b7c5dc1651d38be5e0c64e47d7ffac5..913813d548669691de7599a285441b25180b08b5 100644
--- a/src/Parsers/ExpressionElementParsers.cpp
+++ b/src/Parsers/ExpressionElementParsers.cpp
@@ -588,7 +588,7 @@ static bool tryParseFrameDefinition(ASTWindowDefinition * node, IParser::Pos & p
                             && value.get<Int64>() >= 0)))
             {
                 throw Exception(ErrorCodes::BAD_ARGUMENTS,
-                    "Frame offset for '{}' frame must be a nonnegative integer,  '{}' of type '{}' given.",
+                    "Frame offset for '{}' frame must be a nonnegative integer, '{}' of type '{}' given.",
                     WindowFrame::toString(node->frame.type),
                     applyVisitor(FieldVisitorToString(), value),
                     Field::Types::toString(value.getType()));
@@ -649,7 +649,7 @@ static bool tryParseFrameDefinition(ASTWindowDefinition * node, IParser::Pos & p
                                 && value.get<Int64>() >= 0)))
                 {
                     throw Exception(ErrorCodes::BAD_ARGUMENTS,
-                        "Frame offset for '{}' frame must be a nonnegative integer,  '{}' of type '{}' given.",
+                        "Frame offset for '{}' frame must be a nonnegative integer, '{}' of type '{}' given.",
                         WindowFrame::toString(node->frame.type),
                         applyVisitor(FieldVisitorToString(), value),
                         Field::Types::toString(value.getType()));
diff --git a/src/Processors/Transforms/WindowTransform.cpp b/src/Processors/Transforms/WindowTransform.cpp
index c562fb4ec2c52470c7ebfd0ddc6493cbbfe3b385..3a97698453a9dfc218b3c7bbd5172f46368320a5 100644
--- a/src/Processors/Transforms/WindowTransform.cpp
+++ b/src/Processors/Transforms/WindowTransform.cpp
@@ -1463,9 +1463,9 @@ struct WindowFunctionLagLeadInFrame final : public WindowFunction
     void windowInsertResultInto(const WindowTransform * transform,
         size_t function_index) override
     {
-        auto & current_block = transform->blockAt(transform->current_row);
+        const auto & current_block = transform->blockAt(transform->current_row);
         IColumn & to = *current_block.output_columns[function_index];
-        auto & workspace = transform->workspaces[function_index];
+        const auto & workspace = transform->workspaces[function_index];
 
         int offset = 1;
         if (argument_types.size() > 1)