Please check your workflow background engine and agent listener are working fine,
Follow the below process step to ensure workflow services up and running,,,
1) Start the Workflow Agent listener Service:
a. Workflow administrator Web Applications Responsibility.
b. Workflow Manager.
c. Click on Service Components icon.
d. Click on the Workflow Agent listener Service link (Container column).
e. Select Workflow Agent listener Service.
f. Select Start from the list of values (top).
g. Click on go.
h. Wait until the Workflow Agent listener service is "Activated".
2) Retest the issue