diff --git a/go/vt/vttablet/grpctabletconn/conn.go b/go/vt/vttablet/grpctabletconn/conn.go
index 2399420a8d0..775118aee73 100644
--- a/go/vt/vttablet/grpctabletconn/conn.go
+++ b/go/vt/vttablet/grpctabletconn/conn.go
@@ -188,7 +188,7 @@ func (conn *gRPCQueryClient) StreamExecute(ctx context.Context, target *querypb.
 			fields = ser.Result.Fields
 		}
 		if err := callback(sqltypes.CustomProto3ToResult(fields, ser.Result)); err != nil {
-			if err == nil || err == io.EOF {
+			if err == io.EOF {
 				return nil
 			}
 			return err
@@ -537,7 +537,7 @@ func (conn *gRPCQueryClient) BeginStreamExecute(ctx context.Context, target *que
 			fields = ser.Result.Fields
 		}
 		if err := callback(sqltypes.CustomProto3ToResult(fields, ser.Result)); err != nil {
-			if err == nil || err == io.EOF {
+			if err == io.EOF {
 				return state, nil
 			}
 			return state, err
@@ -583,7 +583,7 @@ func (conn *gRPCQueryClient) MessageStream(ctx context.Context, target *querypb.
 			fields = msr.Result.Fields
 		}
 		if err := callback(sqltypes.CustomProto3ToResult(fields, msr.Result)); err != nil {
-			if err == nil || err == io.EOF {
+			if err == io.EOF {
 				return nil
 			}
 			return err
@@ -640,7 +640,7 @@ func (conn *gRPCQueryClient) StreamHealth(ctx context.Context, callback func(*qu
 			return tabletconn.ErrorFromGRPC(err)
 		}
 		if err := callback(shr); err != nil {
-			if err == nil || err == io.EOF {
+			if err == io.EOF {
 				return nil
 			}
 			return err
@@ -924,7 +924,7 @@ func (conn *gRPCQueryClient) ReserveBeginStreamExecute(ctx context.Context, targ
 			fields = ser.Result.Fields
 		}
 		if err := callback(sqltypes.CustomProto3ToResult(fields, ser.Result)); err != nil {
-			if err == nil || err == io.EOF {
+			if err == io.EOF {
 				return state, nil
 			}
 			return state, err
@@ -1029,7 +1029,7 @@ func (conn *gRPCQueryClient) ReserveStreamExecute(ctx context.Context, target *q
 			fields = ser.Result.Fields
 		}
 		if err := callback(sqltypes.CustomProto3ToResult(fields, ser.Result)); err != nil {
-			if err == nil || err == io.EOF {
+			if err == io.EOF {
 				return state, nil
 			}
 			return state, err
@@ -1092,7 +1092,7 @@ func (conn *gRPCQueryClient) GetSchema(ctx context.Context, target *querypb.Targ
 			return tabletconn.ErrorFromGRPC(err)
 		}
 		if err := callback(shr); err != nil {
-			if err == nil || err == io.EOF {
+			if err == io.EOF {
 				return nil
 			}
 			return err
diff --git a/go/vt/vttablet/onlineddl/executor.go b/go/vt/vttablet/onlineddl/executor.go
index 2c78069e962..3b2dd30c9f6 100644
--- a/go/vt/vttablet/onlineddl/executor.go
+++ b/go/vt/vttablet/onlineddl/executor.go
@@ -778,7 +778,7 @@ func (e *Executor) cutOverVReplMigration(ctx context.Context, s *VReplStream) er
 	defer tmClient.Close()
 
 	// sanity checks:
-	vreplTable, err := getVreplTable(ctx, s)
+	vreplTable, err := getVreplTable(s)
 	if err != nil {
 		return err
 	}
@@ -1422,7 +1422,7 @@ func (e *Executor) initVreplicationRevertMigration(ctx context.Context, onlineDD
 		return nil, err
 	}
 
-	vreplTableName, err := getVreplTable(ctx, revertStream)
+	vreplTableName, err := getVreplTable(revertStream)
 	if err != nil {
 		return nil, err
 	}
diff --git a/go/vt/vttablet/onlineddl/vrepl.go b/go/vt/vttablet/onlineddl/vrepl.go
index 7934aed6af1..5cdb24ae5e4 100644
--- a/go/vt/vttablet/onlineddl/vrepl.go
+++ b/go/vt/vttablet/onlineddl/vrepl.go
@@ -659,16 +659,16 @@ func (v *VRepl) generateStartStatement(ctx context.Context) (string, error) {
 	)
 }
 
-func getVreplTable(ctx context.Context, s *VReplStream) (string, error) {
+func getVreplTable(s *VReplStream) (string, error) {
 	// sanity checks:
 	if s == nil {
-		return "", vterrors.Errorf(vtrpcpb.Code_UNKNOWN, "No vreplication stream migration %s", s.workflow)
+		return "", vterrors.Errorf(vtrpcpb.Code_UNKNOWN, "No vreplication stream migration")
 	}
 	if s.bls.Filter == nil {
 		return "", vterrors.Errorf(vtrpcpb.Code_UNKNOWN, "No binlog source filter for migration %s", s.workflow)
 	}
 	if len(s.bls.Filter.Rules) != 1 {
-		return "", vterrors.Errorf(vtrpcpb.Code_UNKNOWN, "Cannot detect filter rules for migration/vreplication %+v", s.workflow)
+		return "", vterrors.Errorf(vtrpcpb.Code_UNKNOWN, "Cannot detect filter rules for migration/vreplication %s", s.workflow)
 	}
 	vreplTable := s.bls.Filter.Rules[0].Match
 	return vreplTable, nil
diff --git a/go/vt/vttablet/tabletmanager/vdiff/action.go b/go/vt/vttablet/tabletmanager/vdiff/action.go
index 59ee79077f7..ded232bf3c7 100644
--- a/go/vt/vttablet/tabletmanager/vdiff/action.go
+++ b/go/vt/vttablet/tabletmanager/vdiff/action.go
@@ -232,9 +232,6 @@ func (vde *Engine) handleCreateResumeAction(ctx context.Context, dbClient binlog
 		if qr.RowsAffected == 0 {
 			msg := fmt.Sprintf("no completed or stopped vdiff found for UUID %s on tablet %v",
 				req.VdiffUuid, vde.thisTablet.Alias)
-			if err != nil {
-				msg = fmt.Sprintf("%s (%v)", msg, err)
-			}
 			return fmt.Errorf(msg)
 		}
 	}
diff --git a/go/vt/vttablet/tabletmanager/vreplication/queryhistory/sequenced_expectation_set.go b/go/vt/vttablet/tabletmanager/vreplication/queryhistory/sequenced_expectation_set.go
index 9ab0bf99043..95b2c3e4f67 100644
--- a/go/vt/vttablet/tabletmanager/vreplication/queryhistory/sequenced_expectation_set.go
+++ b/go/vt/vttablet/tabletmanager/vreplication/queryhistory/sequenced_expectation_set.go
@@ -12,7 +12,7 @@ type sequencedExpectationSet map[SequencedExpectation]any
 
 func (ses *sequencedExpectationSet) Add(expectation SequencedExpectation) {
 	if ses == nil {
-		*ses = make(sequencedExpectationSet)
+		ses = new(sequencedExpectationSet)
 	}
 	(*ses)[expectation] = true
 }
@@ -27,7 +27,7 @@ func (ses *sequencedExpectationSet) Contains(expectation SequencedExpectation) b
 
 func (ses *sequencedExpectationSet) Slice() []SequencedExpectation {
 	s := make([]SequencedExpectation, 0)
-	if len(*ses) == 0 {
+	if ses == nil || len(*ses) == 0 {
 		return s
 	}
 	for se := range *ses {