diff --git a/k9mail-library/src/main/java/com/fsck/k9/mail/store/imap/ImapConnection.java b/k9mail-library/src/main/java/com/fsck/k9/mail/store/imap/ImapConnection.java
index f92d31e253b..09603f2e100 100644
--- a/k9mail-library/src/main/java/com/fsck/k9/mail/store/imap/ImapConnection.java
+++ b/k9mail-library/src/main/java/com/fsck/k9/mail/store/imap/ImapConnection.java
@@ -692,6 +692,10 @@ protected boolean isIdleCapable() {
     }
 
     public void close() {
+        if (!open) {
+            return;
+        }
+
         open = false;
         stacktraceForClose = new Exception();