diff --git a/base/src/main/java/de/staropensource/sosengine/base/internal/implementation/placeholder/crashhandler/StacktraceAll.java b/base/src/main/java/de/staropensource/sosengine/base/internal/implementation/placeholder/crashhandler/StacktraceAll.java
index d897ae8..c8bbfa2 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/internal/implementation/placeholder/crashhandler/StacktraceAll.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/internal/implementation/placeholder/crashhandler/StacktraceAll.java
@@ -56,7 +56,7 @@ public final class StacktraceAll implements Placeholder {
                     .append(" priority=")
                     .append(thread.getPriority())
                     .append(" group=")
-                    .append(thread.getThreadGroup().getName())
+                    .append(thread.getThreadGroup() == null ? "<unknown>" : thread.getThreadGroup().getName())
                     .append(" state=")
                     .append(thread.getState().name())
                     .append(" daemon=")