diff --git a/openmc/filter.py b/openmc/filter.py
index 676bc66e17..526ee52e5a 100644
--- a/openmc/filter.py
+++ b/openmc/filter.py
@@ -777,9 +777,12 @@ class MeshFilter(Filter):
         # Find mesh dimensions - use 3D indices for simplicity
         if len(self.mesh.dimension) == 3:
             nx, ny, nz = self.mesh.dimension
-        else:
+        elif len(self.mesh.dimension) == 2:
             nx, ny = self.mesh.dimension
             nz = 1
+        else:
+            nx = self.mesh.dimension
+            ny = nz = 1
 
         # Generate multi-index sub-column for x-axis
         filter_bins = np.arange(1, nx + 1)
diff --git a/src/nuclide_header.F90 b/src/nuclide_header.F90
index ed4a9a0a6c..ea6eab328f 100644
--- a/src/nuclide_header.F90
+++ b/src/nuclide_header.F90
@@ -224,11 +224,12 @@ module nuclide_header
     call sort(temps_available)
 
     ! If only one temperature is available, revert to nearest temperature
-    if (size(temps_available) == 1 .and. &
-         method == TEMPERATURE_INTERPOLATION .and. master) then
-      call warning("Cross sections for " // trim(this % name) // " are only &
-           &available at one temperature. Reverting to nearest temperature &
-           &method.")
+    if (size(temps_available) == 1 .and. method == TEMPERATURE_INTERPOLATION) then
+      if (master) then
+        call warning("Cross sections for " // trim(this % name) // " are only &
+             &available at one temperature. Reverting to nearest temperature &
+             &method.")
+      end if
       method = TEMPERATURE_NEAREST
     end if
 
diff --git a/src/physics.F90 b/src/physics.F90
index a946c161b2..d1e9921ef6 100644
--- a/src/physics.F90
+++ b/src/physics.F90
@@ -481,7 +481,11 @@ contains
     ! Sample scattering angle
     select type (dist => rxn % products(1) % distribution(1) % obj)
     type is (UncorrelatedAngleEnergy)
-      mu_cm = dist % angle % sample(E)
+      if (allocated(dist % angle % energy)) then
+        mu_cm = dist % angle % sample(E)
+      else
+        mu_cm = TWO*prn() - ONE
+      end if
     end select
 
     ! Determine direction cosines in CM