diff --git a/blender_asset_tracer/blendfile/__init__.py b/blender_asset_tracer/blendfile/__init__.py
index 361efe6..5335678 100644
--- a/blender_asset_tracer/blendfile/__init__.py
+++ b/blender_asset_tracer/blendfile/__init__.py
@@ -97,15 +97,19 @@ class BlendFile:
             fileobj.close()
             raise exceptions.BlendFileError("File is not a blend file", path)
 
-        self.header = header.BlendFileHeader(self.fileobj, self.raw_filepath)
-        self.block_header_struct = self.header.create_block_header_struct()
         self.blocks = []
         self.code_index = collections.defaultdict(list)
         self.structs = []
         self.sdna_index_from_id = {}
         self.block_from_addr = {}
 
-        self._load_blocks()
+        try:
+            self.header = header.BlendFileHeader(self.fileobj, self.raw_filepath)
+            self.block_header_struct = self.header.create_block_header_struct()
+            self._load_blocks()
+        except Exception:
+            fileobj.close()
+            raise
 
     def _load_blocks(self):
         """Read the blend file to load its DNA structure to memory."""
@@ -304,7 +308,7 @@ class BlendFileBlock:
         if len(data) != header_struct.size:
             self.log.warning("Blend file %s seems to be truncated, "
                              "expected %d bytes but could read only %d",
-                             header_struct.size, len(data))
+                             bfile.filepath, header_struct.size, len(data))
             self.code = b'ENDB'
             return
 
diff --git a/tests/blendfiles/corrupt_only_magic.blend b/tests/blendfiles/corrupt_only_magic.blend
new file mode 100644
index 0000000..feedba8
Binary files /dev/null and b/tests/blendfiles/corrupt_only_magic.blend differ
diff --git a/tests/test_blendfile_loading.py b/tests/test_blendfile_loading.py
index 2baeccc..3cae760 100644
--- a/tests/test_blendfile_loading.py
+++ b/tests/test_blendfile_loading.py
@@ -1,6 +1,5 @@
 import os
 import pathlib
-import unittest
 
 from blender_asset_tracer import blendfile
 from blender_asset_tracer.blendfile import iterators, exceptions
@@ -210,7 +209,11 @@ class LoadCompressedTest(AbstractBlendFileTest):
         self.assertEqual('OBümlaut', name)
 
 
-class LoadNonBlendfileTest(unittest.TestCase):
+class LoadNonBlendfileTest(AbstractBlendFileTest):
     def test_loading(self):
         with self.assertRaises(exceptions.BlendFileError):
             blendfile.BlendFile(pathlib.Path(__file__))
+
+    def test_no_datablocks(self):
+        with self.assertRaises(exceptions.NoDNA1Block):
+            blendfile.BlendFile(self.blendfiles / 'corrupt_only_magic.blend')