diff --git a/ca_source_extraction/@Sources2D/initTemporal.m b/ca_source_extraction/@Sources2D/initTemporal.m
index 888fdab..4edcead 100644
--- a/ca_source_extraction/@Sources2D/initTemporal.m
+++ b/ca_source_extraction/@Sources2D/initTemporal.m
@@ -137,15 +137,9 @@ function initTemporal(obj, frame_range, use_parallel)
         end
         A_patch = A{mpatch};
         
-        if isempty(A_patch)
-            fprintf('Patch (%2d, %2d) is done. %2d X %2d patches in total. \n', r, c, nr_patch, nc_patch);
-            continue;
-        end
-        
         % use ind_patch to indicate pixels within the patch
         ind_patch = false(diff(tmp_block(1:2))+1, diff(tmp_block(3:4))+1);
         ind_patch((tmp_patch(1):tmp_patch(2))-tmp_block(1)+1, (tmp_patch(3):tmp_patch(4))-tmp_block(3)+1) = true;
-        AA{mpatch}= sum(A_patch(ind_patch,:).^2, 1);
         
         % get data
         if strcmpi(bg_model, 'ring')
@@ -159,6 +153,12 @@ function initTemporal(obj, frame_range, use_parallel)
         Ymean{mpatch} = temp((tmp_patch(1):tmp_patch(2))-tmp_block(1)+1, (tmp_patch(3):tmp_patch(4))-tmp_block(3)+1);
         Ypatch = reshape(Ypatch, [], T);
         
+        if isempty(A_patch)
+            fprintf('Patch (%2d, %2d) is done. %2d X %2d patches in total. \n', r, c, nr_patch, nc_patch);
+            continue;
+        end
+        AA{mpatch}= sum(A_patch(ind_patch,:).^2, 1);
+        
         % get background
         if strcmpi(bg_model, 'ring')
             W_ring = W{mpatch};
@@ -207,15 +207,9 @@ function initTemporal(obj, frame_range, use_parallel)
         end
         A_patch = A{mpatch};
         
-        if isempty(A_patch)
-            fprintf('Patch (%2d, %2d) is done. %2d X %2d patches in total. \n', r, c, nr_patch, nc_patch);
-            continue;
-        end
-        
         % use ind_patch to indicate pixels within the patch
         ind_patch = false(diff(tmp_block(1:2))+1, diff(tmp_block(3:4))+1);
         ind_patch((tmp_patch(1):tmp_patch(2))-tmp_block(1)+1, (tmp_patch(3):tmp_patch(4))-tmp_block(3)+1) = true;
-        AA{mpatch}= sum(A_patch(ind_patch,:).^2, 1);
         
         % get data
         if strcmpi(bg_model, 'ring')
@@ -229,6 +223,12 @@ function initTemporal(obj, frame_range, use_parallel)
         Ymean{mpatch} = temp((tmp_patch(1):tmp_patch(2))-tmp_block(1)+1, (tmp_patch(3):tmp_patch(4))-tmp_block(3)+1);
         Ypatch = reshape(Ypatch, [], T);
         
+        if isempty(A_patch)
+            fprintf('Patch (%2d, %2d) is done. %2d X %2d patches in total. \n', r, c, nr_patch, nc_patch);
+            continue;
+        end
+        AA{mpatch}= sum(A_patch(ind_patch,:).^2, 1);
+        
         % get background
         if strcmpi(bg_model, 'ring')
             W_ring = W{mpatch};