diff --git a/SOURCES/0012-Ensure-correct-type-of-mpath-cache-member-list.patch b/SOURCES/0012-Ensure-correct-type-of-mpath-cache-member-list.patch
new file mode 100644
index 0000000..57ee76a
--- /dev/null
+++ b/SOURCES/0012-Ensure-correct-type-of-mpath-cache-member-list.patch
@@ -0,0 +1,31 @@
+From d01281a69e317d7bae4a7698edb6583b6310d5c1 Mon Sep 17 00:00:00 2001
+From: David Lehman <dlehman@redhat.com>
+Date: Tue, 19 Mar 2019 11:51:47 -0400
+Subject: [PATCH] Ensure correct type of mpath cache member list.
+
+Related: rhbz#1672971
+---
+ blivet/static_data/mpath_info.py | 7 +++++--
+ 1 file changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/blivet/static_data/mpath_info.py b/blivet/static_data/mpath_info.py
+index 49ba4709..64958ba8 100644
+--- a/blivet/static_data/mpath_info.py
++++ b/blivet/static_data/mpath_info.py
+@@ -42,8 +42,11 @@ class MpathMembers(object):
+         :param str device: path of the device to query
+ 
+         """
+-        if self._members is None and availability.BLOCKDEV_MPATH_PLUGIN.available:
+-            self._members = set(blockdev.mpath.get_mpath_members())
++        if self._members is None:
++            if availability.BLOCKDEV_MPATH_PLUGIN.available:
++                self._members = set(blockdev.mpath.get_mpath_members())
++            else:
++                self._members = set()
+ 
+         device = os.path.realpath(device)
+         device = device[len("/dev/"):]
+-- 
+2.20.1
+
diff --git a/SPECS/python-blivet.spec b/SPECS/python-blivet.spec
index 1492f14..7f8b96a 100644
--- a/SPECS/python-blivet.spec
+++ b/SPECS/python-blivet.spec
@@ -23,7 +23,7 @@ Version: 3.1.0
 
 #%%global prerelease .b2
 # prerelease, if defined, should be something like .a1, .b1, .b2.dev1, or .c2
-Release: 9%{?prerelease}%{?dist}
+Release: 10%{?prerelease}%{?dist}
 Epoch: 1
 License: LGPLv2+
 Group: System Environment/Libraries
@@ -42,6 +42,7 @@ Patch8: 0008-po-updates.patch
 Patch9: 0009-Require-libfc-instead-of-fcoe-for-offloaded-FCoE.-15.patch
 Patch10: 0010-Use-udev-to-determine-if-disk-is-a-multipath-member.patch
 Patch11: 0011-Don-t-crash-if-blockdev-mpath-plugin-isn-t-available.patch
+Patch12: 0012-Ensure-correct-type-of-mpath-cache-member-list.patch
 
 # Versions of required components (done so we make sure the buildrequires
 # match the requires versions of things).
@@ -202,6 +203,10 @@ configuration.
 %endif
 
 %changelog
+* Wed Apr 03 2019 David Lehman <dlehman@redhat.com> - 3.1.0-10
+- Ensure correct type of mpath cache member list.
+  Related: rhbz#1672971
+
 * Mon Feb 25 2019 David Lehman <dlehman@redhat.com> - 3.1.0-9
 - Update to latest translations.
   Resolves: rhbz#1608337