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-rw-r--r--src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
index 80e84c156..98f74ac84 100644
--- a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -1229,7 +1229,10 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
buf.readUnsignedByte(); // external device type code
int length = buf.readableBytes() - 9; // line break + checksum + index + checksum + footer
- if (length < 8) {
+
+ if (length <= 0) {
+ return null;
+ } else if (length < 8) {
position.set(
Position.PREFIX_TEMP + 1,
Double.parseDouble(buf.readCharSequence(length - 1, StandardCharsets.US_ASCII).toString()));