diff --git a/gif/ImageTestSuite/metadata/0646caeb9b9161c777f117007921a687.gif.txt b/gif/ImageTestSuite/metadata/0646caeb9b9161c777f117007921a687.gif.txt
index 01a8e24..809d204 100644
--- a/gif/ImageTestSuite/metadata/0646caeb9b9161c777f117007921a687.gif.txt
+++ b/gif/ImageTestSuite/metadata/0646caeb9b9161c777f117007921a687.gif.txt
@@ -1,6 +1,8 @@
 FILE: 0646caeb9b9161c777f117007921a687.gif
 TYPE: GIF
 
+[ERROR: Error] Unknown gif block marker found.
+
 [GIF Header - 0x0001] GIF Format Version = 89a
 [GIF Header - 0x0002] Image Width = 192
 [GIF Header - 0x0003] Image Height = 168
@@ -139,6 +141,7 @@ by Right to Left Software Inc.
 - GIF Image
 - GIF Control
 - GIF Image
+- Error
 - File
 
 Generated using metadata-extractor
diff --git a/gif/ImageTestSuite/metadata/243d9798466d64aba0acaa41f980bea6.gif.txt b/gif/ImageTestSuite/metadata/243d9798466d64aba0acaa41f980bea6.gif.txt
index 6aba9ba..7cc35b1 100644
--- a/gif/ImageTestSuite/metadata/243d9798466d64aba0acaa41f980bea6.gif.txt
+++ b/gif/ImageTestSuite/metadata/243d9798466d64aba0acaa41f980bea6.gif.txt
@@ -1,6 +1,8 @@
 FILE: 243d9798466d64aba0acaa41f980bea6.gif
 TYPE: GIF
 
+[ERROR: Error] Unknown gif block marker found.
+
 [GIF Header - 0x0001] GIF Format Version = 89a
 [GIF Header - 0x0002] Image Width = 192
 [GIF Header - 0x0003] Image Height = 168
@@ -80,6 +82,7 @@ by Right to Left Software Inc.
 - GIF Control
 - GIF Image
 - GIF Control
+- Error
 - File
 
 Generated using metadata-extractor
diff --git a/gif/ImageTestSuite/metadata/7092f253998c1b6b869707ad7ae92854.gif.txt b/gif/ImageTestSuite/metadata/7092f253998c1b6b869707ad7ae92854.gif.txt
index 3ceb577..34657a1 100644
--- a/gif/ImageTestSuite/metadata/7092f253998c1b6b869707ad7ae92854.gif.txt
+++ b/gif/ImageTestSuite/metadata/7092f253998c1b6b869707ad7ae92854.gif.txt
@@ -1,6 +1,8 @@
 FILE: 7092f253998c1b6b869707ad7ae92854.gif
 TYPE: GIF
 
+[ERROR: Error] Unknown gif block marker found.
+
 [GIF Header - 0x0001] GIF Format Version = 89a
 [GIF Header - 0x0002] Image Width = 192
 [GIF Header - 0x0003] Image Height = 168
@@ -80,6 +82,7 @@ by Right to Left Software Inc.
 - GIF Control
 - GIF Image
 - GIF Control
+- Error
 - File
 
 Generated using metadata-extractor
diff --git a/gif/ImageTestSuite/metadata/ce774930ac70449f38a18789c70095b8.gif.txt b/gif/ImageTestSuite/metadata/ce774930ac70449f38a18789c70095b8.gif.txt
index 051933c..95c4f35 100644
--- a/gif/ImageTestSuite/metadata/ce774930ac70449f38a18789c70095b8.gif.txt
+++ b/gif/ImageTestSuite/metadata/ce774930ac70449f38a18789c70095b8.gif.txt
@@ -1,6 +1,8 @@
 FILE: ce774930ac70449f38a18789c70095b8.gif
 TYPE: GIF
 
+[ERROR: Error] Unknown gif block marker found.
+
 [GIF Header - 0x0001] GIF Format Version = 89a
 [GIF Header - 0x0002] Image Width = 120
 [GIF Header - 0x0003] Image Height = 124
@@ -101,6 +103,7 @@ TYPE: GIF
 - GIF Image
 - GIF Control
 - GIF Image
+- Error
 - File
 
 Generated using metadata-extractor