diff --git a/debian/changelog b/debian/changelog
index 447d371..0874372 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -15,6 +15,8 @@ ubuntu-dev-tools (0.144) UNRELEASED; urgency=low
     - Avoid duplicate Reverse-Build-Deps when sources build binaries of the
       same name.
     - Explain that backports aren't to fix bugs.
+  * sponsor-patch: Don't fall over bugs targetted at the development release
+    (LP: #936014)
 
   [ Benjamin Drung ]
   * seeded-in-ubuntu: State in error message that it takes a source package.
diff --git a/ubuntutools/sponsor_patch/sponsor_patch.py b/ubuntutools/sponsor_patch/sponsor_patch.py
index 5e91b06..2642918 100644
--- a/ubuntutools/sponsor_patch/sponsor_patch.py
+++ b/ubuntutools/sponsor_patch/sponsor_patch.py
@@ -202,6 +202,9 @@ def get_open_ubuntu_bug_task(launchpad, bug, branch=None):
         tasks = [task for task in ubuntu_tasks
                       if task.get_series() == branch[2]
                          and task.package == branch[3]]
+        if len(tasks) > 1:
+            # A bug targetted to the development series?
+            tasks = [task for task in tasks if task.series is not None]
         assert len(tasks) == 1
         task = tasks[0]
     elif len(ubuntu_tasks) > 1: