diff --git a/Dockerfile b/Dockerfile
index e8903fc4c..a87183b0a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -63,7 +63,7 @@ ENV BUILD_DEPS="apt-utils bsdtar gnupg gosu wget curl bzip2 g++ build-essential
     LDAP_AUTHENTIFICATION_PASSWORD="" \
     LDAP_LOG_ENABLED=false \
     LDAP_BACKGROUND_SYNC=false \
-    LDAP_BACKGROUND_SYNC_INTERVAL=100 \
+    LDAP_BACKGROUND_SYNC_INTERVAL="" \
     LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=false \
     LDAP_BACKGROUND_SYNC_IMPORT_NEW_USERS=false \
     LDAP_ENCRYPTION=false \
diff --git a/docker-compose.yml b/docker-compose.yml
index 72d7ec5b4..b17d8be0f 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -429,8 +429,10 @@ services:
       # If the sync of the users should be done in the background
       #- LDAP_BACKGROUND_SYNC=false
       #
-      # At which interval does the background task sync in milliseconds
-      #- LDAP_BACKGROUND_SYNC_INTERVAL=100
+      # At which interval does the background task sync in milliseconds.
+      # Leave this unset, so it uses default, and does not crash.
+      # https://github.com/wekan/wekan/issues/2354#issuecomment-515305722
+      - LDAP_BACKGROUND_SYNC_INTERVAL=''
       #
       #- LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=false
       #
diff --git a/releases/virtualbox/start-wekan.sh b/releases/virtualbox/start-wekan.sh
index a300d44d3..a1b0fa694 100755
--- a/releases/virtualbox/start-wekan.sh
+++ b/releases/virtualbox/start-wekan.sh
@@ -224,8 +224,10 @@
         # example :  export LDAP_BACKGROUND_SYNC=true
         #export LDAP_BACKGROUND_SYNC=false
         # LDAP_BACKGROUND_SYNC_INTERVAL : At which interval does the background task sync in milliseconds
-        # example :  export LDAP_BACKGROUND_SYNC_INTERVAL=12345
-        #export LDAP_BACKGROUND_SYNC_INTERVAL=100
+        # At which interval does the background task sync in milliseconds.
+        # Leave this unset, so it uses default, and does not crash.
+        # https://github.com/wekan/wekan/issues/2354#issuecomment-515305722
+        export LDAP_BACKGROUND_SYNC_INTERVAL=''
         # LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED :
         # example :  export LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=true
         #export LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=false
diff --git a/snap-src/bin/config b/snap-src/bin/config
index 631beec11..522635cdb 100755
--- a/snap-src/bin/config
+++ b/snap-src/bin/config
@@ -267,7 +267,7 @@ DEFAULT_LDAP_BACKGROUND_SYNC="false"
 KEY_LDAP_BACKGROUND_SYNC="ldap-background-sync"
 
 DESCRIPTION_LDAP_BACKGROUND_SYNC_INTERVAL="At which interval does the background task sync in milliseconds"
-DEFAULT_LDAP_BACKGROUND_SYNC_INTERVAL="100"
+DEFAULT_LDAP_BACKGROUND_SYNC_INTERVAL=""
 KEY_LDAP_BACKGROUND_SYNC_INTERVAL="ldap-background-sync-interval"
 
 DESCRIPTION_LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=""
diff --git a/snap-src/bin/wekan-help b/snap-src/bin/wekan-help
index b53a5738b..19bc1462d 100755
--- a/snap-src/bin/wekan-help
+++ b/snap-src/bin/wekan-help
@@ -280,8 +280,10 @@ echo -e "If the sync of the users should be done in the background:"
 echo -e "\t$ snap set $SNAP_NAME ldap-background-sync='true'"
 echo -e "\n"
 echo -e "Ldap Background Sync Interval."
-echo -e "At which interval does the background task sync in milliseconds:"
-echo -e "\t$ snap set $SNAP_NAME ldap-background-sync-interval='12345'"
+echo -e "At which interval does the background task sync in milliseconds."
+echo -e "Leave this unset, so it uses default, and does not crash."
+echo -e "https://github.com/wekan/wekan/issues/2354#issuecomment-515305722"
+echo -e "\t$ snap set $SNAP_NAME ldap-background-sync-interval=''"
 echo -e "\n"
 echo -e "Ldap Background Sync Keep Existant Users Updated."
 echo -e "\t$ snap set $SNAP_NAME ldap-background-sync-keep-existant-users-updated='true'"
diff --git a/start-wekan.bat b/start-wekan.bat
index d84e9eb15..f51d1f082 100755
--- a/start-wekan.bat
+++ b/start-wekan.bat
@@ -216,8 +216,10 @@ REM # example : LDAP_BACKGROUND_SYNC=true
 REM SET LDAP_BACKGROUND_SYNC=false
 
 REM # LDAP_BACKGROUND_SYNC_INTERVAL : At which interval does the background task sync in milliseconds
-REM # example : LDAP_BACKGROUND_SYNC_INTERVAL=12345
-REM SET LDAP_BACKGROUND_SYNC_INTERVAL=100
+REM # At which interval does the background task sync in milliseconds.
+REM # Leave this unset, so it uses default, and does not crash.
+REM # https://github.com/wekan/wekan/issues/2354#issuecomment-515305722
+SET LDAP_BACKGROUND_SYNC_INTERVAL=''
 
 REM # LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED :
 REM # example : LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=true
diff --git a/start-wekan.sh b/start-wekan.sh
index 48337d3c5..48f8f5171 100755
--- a/start-wekan.sh
+++ b/start-wekan.sh
@@ -226,8 +226,10 @@
       # example :  export LDAP_BACKGROUND_SYNC=true
       #export LDAP_BACKGROUND_SYNC=false
       # LDAP_BACKGROUND_SYNC_INTERVAL : At which interval does the background task sync in milliseconds
-      # example :  export LDAP_BACKGROUND_SYNC_INTERVAL=12345
-      #export LDAP_BACKGROUND_SYNC_INTERVAL=100
+      # At which interval does the background task sync in milliseconds.
+      # Leave this unset, so it uses default, and does not crash.
+      # https://github.com/wekan/wekan/issues/2354#issuecomment-515305722
+      export LDAP_BACKGROUND_SYNC_INTERVAL=''
       # LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED :
       # example :  export LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=true
       #export LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=false
diff --git a/torodb-postgresql/docker-compose.yml b/torodb-postgresql/docker-compose.yml
index c81d19b5b..4a6a745d2 100644
--- a/torodb-postgresql/docker-compose.yml
+++ b/torodb-postgresql/docker-compose.yml
@@ -132,7 +132,7 @@ services:
         ' 1>/dev/null 2>&1 &
         mongod --replSet rs1
   wekan:
-    image: quay.io/wekan/wekan
+    image: wekanteam/wekan:latestdevel
     container_name: wekan-app
     restart: always
     networks:
@@ -337,8 +337,9 @@ services:
       #- LDAP_BACKGROUND_SYNC=false
       #
       # LDAP_BACKGROUND_SYNC_INTERVAL : At which interval does the background task sync in milliseconds
-      # example : LDAP_BACKGROUND_SYNC_INTERVAL=12345
-      #- LDAP_BACKGROUND_SYNC_INTERVAL=100
+      # Leave this unset, so it uses default, and does not crash.
+      # https://github.com/wekan/wekan/issues/2354#issuecomment-515305722
+      - LDAP_BACKGROUND_SYNC_INTERVAL=''
       #
       # LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED :
       # example : LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=true