diff --git a/changelog/james-prysm_handle-pbgeneric-error.md b/changelog/james-prysm_handle-pbgeneric-error.md
new file mode 100644
index 0000000000..a5ee15ed31
--- /dev/null
+++ b/changelog/james-prysm_handle-pbgeneric-error.md
@@ -0,0 +1,3 @@
+### Fixed
+
+- fix panic with type cast on pbgenericblock()
diff --git a/consensus-types/blocks/getters.go b/consensus-types/blocks/getters.go
index 99f9dbf5cd..cb99e52ec1 100644
--- a/consensus-types/blocks/getters.go
+++ b/consensus-types/blocks/getters.go
@@ -124,8 +124,12 @@ func (b *SignedBeaconBlock) PbGenericBlock() (*eth.GenericSignedBeaconBlock, err
 				Block: &eth.GenericSignedBeaconBlock_BlindedDeneb{BlindedDeneb: pb.(*eth.SignedBlindedBeaconBlockDeneb)},
 			}, nil
 		}
+		bc, ok := pb.(*eth.SignedBeaconBlockContentsDeneb)
+		if !ok {
+			return nil, fmt.Errorf("PbGenericBlock() only supports block content type but got %T", pb)
+		}
 		return &eth.GenericSignedBeaconBlock{
-			Block: &eth.GenericSignedBeaconBlock_Deneb{Deneb: pb.(*eth.SignedBeaconBlockContentsDeneb)},
+			Block: &eth.GenericSignedBeaconBlock_Deneb{Deneb: bc},
 		}, nil
 	case version.Electra:
 		if b.IsBlinded() {
@@ -133,8 +137,12 @@ func (b *SignedBeaconBlock) PbGenericBlock() (*eth.GenericSignedBeaconBlock, err
 				Block: &eth.GenericSignedBeaconBlock_BlindedElectra{BlindedElectra: pb.(*eth.SignedBlindedBeaconBlockElectra)},
 			}, nil
 		}
+		bc, ok := pb.(*eth.SignedBeaconBlockContentsElectra)
+		if !ok {
+			return nil, fmt.Errorf("PbGenericBlock() only supports block content type but got %T", pb)
+		}
 		return &eth.GenericSignedBeaconBlock{
-			Block: &eth.GenericSignedBeaconBlock_Electra{Electra: pb.(*eth.SignedBeaconBlockContentsElectra)},
+			Block: &eth.GenericSignedBeaconBlock_Electra{Electra: bc},
 		}, nil
 	case version.Fulu:
 		if b.IsBlinded() {
@@ -142,8 +150,12 @@ func (b *SignedBeaconBlock) PbGenericBlock() (*eth.GenericSignedBeaconBlock, err
 				Block: &eth.GenericSignedBeaconBlock_BlindedFulu{BlindedFulu: pb.(*eth.SignedBlindedBeaconBlockFulu)},
 			}, nil
 		}
+		bc, ok := pb.(*eth.SignedBeaconBlockContentsFulu)
+		if !ok {
+			return nil, fmt.Errorf("PbGenericBlock() only supports block content type but got %T", pb)
+		}
 		return &eth.GenericSignedBeaconBlock{
-			Block: &eth.GenericSignedBeaconBlock_Fulu{Fulu: pb.(*eth.SignedBeaconBlockContentsFulu)},
+			Block: &eth.GenericSignedBeaconBlock_Fulu{Fulu: bc},
 		}, nil
 	default:
 		return nil, errIncorrectBlockVersion
diff --git a/testing/util/block_test.go b/testing/util/block_test.go
index c95d3d0a92..77e2872af9 100644
--- a/testing/util/block_test.go
+++ b/testing/util/block_test.go
@@ -322,3 +322,30 @@ func TestGenerateVoluntaryExits(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, coreBlock.VerifyExitAndSignature(val, beaconState, exit))
 }
+
+func Test_PostDenebPbGenericBlock_ErrorsForPlainBlock(t *testing.T) {
+	t.Run("Deneb block returns type error", func(t *testing.T) {
+		eb := NewBeaconBlockDeneb()
+		b, err := blocks.NewSignedBeaconBlock(eb)
+		require.NoError(t, err)
+
+		_, err = b.PbGenericBlock()
+		require.ErrorContains(t, "PbGenericBlock() only supports block content type but got", err)
+	})
+	t.Run("Electra block returns type error", func(t *testing.T) {
+		eb := NewBeaconBlockElectra()
+		b, err := blocks.NewSignedBeaconBlock(eb)
+		require.NoError(t, err)
+
+		_, err = b.PbGenericBlock()
+		require.ErrorContains(t, "PbGenericBlock() only supports block content type but got", err)
+	})
+	t.Run("Fulu block returns type error", func(t *testing.T) {
+		eb := NewBeaconBlockFulu()
+		b, err := blocks.NewSignedBeaconBlock(eb)
+		require.NoError(t, err)
+
+		_, err = b.PbGenericBlock()
+		require.ErrorContains(t, "PbGenericBlock() only supports block content type but got", err)
+	})
+}