diff --git a/matlab/kalman/likelihood/missing_observations_kalman_filter.m b/matlab/kalman/likelihood/missing_observations_kalman_filter.m
index 9bdbb6f0d..ba5145fad 100644
--- a/matlab/kalman/likelihood/missing_observations_kalman_filter.m
+++ b/matlab/kalman/likelihood/missing_observations_kalman_filter.m
@@ -234,6 +234,9 @@ while notsteady && t<=last
         occbin_options.opts_simul.waitbar=0;
         [ax, a1x, Px, P1x, vx, Tx, Rx, Cx, regimes_(t:t+2), info, M_, likx] = occbin.kalman_update_algo_1(a0(:,t-1),a1(:,t-1:t),P0(:,:,t-1),P1(:,:,t-1:t),data_index(t-1:t),Z,vv(:,t-1:t),Y(:,t-1:t),H,Qt,T0,R0,TT(:,:,t-1:t),RR(:,:,t-1:t),CC(:,t-1:t),regimes_(t:t+1),M_,oo_,options_,occbin_options);
         if info
+            if options_.debug
+                fprintf('\nmissing_observations_kalman_filter:PKF failed with: %s\n', get_error_message(info,options_));
+            end
             return
         end
         if options_.occbin.likelihood.use_updated_regime