diff --git a/solar_ble.py b/solar_ble.py
index 097bab1..a0518b1 100755
--- a/solar_ble.py
+++ b/solar_ble.py
@@ -305,7 +305,11 @@ def readMemory(fh: RawIOBase, address: int, words: int = 1) -> Optional[bytes]:
         data = fh.read(size)
         _crc = fh.read(2)
         if data and _crc:
-            crc = struct.unpack_from("<H", _crc)[0]
+            try:
+                crc = struct.unpack_from("<H", _crc)[0]
+            except struct.error:
+                log(f"readMemory: CRC error; read {len(_crc)} bytes (2 expected)")
+                return None
             calculated_crc = modbus(bytes([tag, operation, size, *data]))
             if crc == calculated_crc:
                 return data