host/logmux: Fix nil cursor panic when reading empty log

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
flynn · Jan 14, 2019 · 0c23b67 · 0c23b67
1 parent 3a91c80
commit 0c23b67
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/host/logmux/logmux.go b/host/logmux/logmux.go
@@ -246,7 +246,7 @@ func (m *Mux) addSink(sink Sink) {
 								l.Error("failed to scan message", "error", err)
 								return
 							}
-							if !cursorSaved && i == len(appLogs[appID])-1 {
+							if cursor != nil && !cursorSaved && i == len(appLogs[appID])-1 {
 								// last file, send cursor to processing goroutine
 								bufferCursorsMtx.Lock()
 								bufferCursors[appID] = *cursor