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-rw-r--r--src/org/traccar/protocol/LaipacSFKamelProtocolDecoder.java3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/org/traccar/protocol/LaipacSFKamelProtocolDecoder.java b/src/org/traccar/protocol/LaipacSFKamelProtocolDecoder.java
index 0d3995144..dc169c668 100644
--- a/src/org/traccar/protocol/LaipacSFKamelProtocolDecoder.java
+++ b/src/org/traccar/protocol/LaipacSFKamelProtocolDecoder.java
@@ -118,8 +118,9 @@ public class LaipacSFKamelProtocolDecoder extends BaseProtocolDecoder {
checksum = parser.next();
}
+
String result = sentence.replaceAll("^\\$(.*)\\*[0-9a-fA-F]{2}$", "$1");
- if (Integer.parseInt(checksum, 16) != Checksum.xor(result))
+ if (checksum == null || Integer.parseInt(checksum, 16) != Checksum.xor(result))
{
return null;
}