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-rw-r--r--src/main/java/org/traccar/StringProtocolEncoder.java2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/main/java/org/traccar/StringProtocolEncoder.java b/src/main/java/org/traccar/StringProtocolEncoder.java
index 40dfb25b6..e9fb65500 100644
--- a/src/main/java/org/traccar/StringProtocolEncoder.java
+++ b/src/main/java/org/traccar/StringProtocolEncoder.java
@@ -39,7 +39,7 @@ public abstract class StringProtocolEncoder extends BaseProtocolEncoder {
if (valueFormatter != null) {
value = valueFormatter.formatValue(keys[i], object);
}
- if (value == null) {
+ if (value == null && object != null) {
value = object.toString();
}
if (value == null) {