diff --git a/sources/interpolations.F90 b/sources/interpolations.F90
index f329792..0db9c30 100644
--- a/sources/interpolations.F90
+++ b/sources/interpolations.F90
@@ -231,6 +231,17 @@ module interpolations
 !
     kappa = min(kappa, (1.0d+00 - cfl) / cfl)
 
+! check ngp
+!
+    if (mod(ngp,2) == 0 .or. ngp < 3) then
+      if (verbose) then
+        write(error_unit,"('[', a, ']: ', a)") trim(loc),                      &
+                         "The parameter ngp has to be an odd integer >= 3. "// &
+                         "Resetting to default value of ngp = 5."
+      end if
+      ngp = 5
+    end if
+
 ! calculate mgp
 !
     mgp   = (ngp - 1) / 2
@@ -349,22 +360,12 @@ module interpolations
       reconstruct_states => reconstruct_gp
       order              = ngp
 
-! check the parameters
-!
-      if (mod(ngp,2) == 0) then
-        if (verbose) then
-          write(*,*)
-          write(*,"(1x,a)") "ERROR!"
-          write(*,"(1x,a)") "The parameter ngp has to be an odd integer >= 3."
-        end if
-        status = 1
-      else
-        ng = 2
-        do while(ng < (ngp + 1) / 2)
-          ng = ng + 2
-        end do
-        nghosts = max(nghosts, ng)
-      end if
+      ng = 2
+      do while(ng < (ngp + 1) / 2)
+        ng = ng + 2
+      end do
+      nghosts = max(nghosts, ng)
+
     case ("mgp", "MGP")
       write(stmp, '(f16.1)') sgp
       write(name_rec, &
@@ -379,35 +380,24 @@ module interpolations
 !
       if (status == 0) call prepare_mgp(status)
 
-      interfaces         => interfaces_mgp
+      interfaces => interfaces_mgp
+
+      ng = 2
+      do while(ng < (ngp + 1) / 2)
+        ng = ng + 2
+      end do
+      nghosts = max(nghosts, ng)
 
-! check the parameters
-!
-      if (mod(ngp,2) == 0) then
-        if (verbose) then
-          write(*,*)
-          write(*,"(1x,a)") "ERROR!"
-          write(*,"(1x,a)") "The parameter ngp has to be an odd integer >= 3."
-        end if
-        status = 1
-      else
-        ng = 2
-        do while(ng < (ngp + 1) / 2)
-          ng = ng + 2
-        end do
-        nghosts = max(nghosts, ng)
-      end if
     case default
 
       if (verbose) then
-        write(*,*)
-        write(*,"(1x,a)") "ERROR!"
-        write(*,"(1x,a)") "The selected reconstruction method is not "    //   &
-                          "implemented: " // trim(sreconstruction)
-        write(*,"(1x,a)") "Available methods: 'tvd' 'limo3', 'ppm',"      //   &
-                          " 'weno3', 'weno5z', 'weno5yc', 'weno5ns',"     //   &
-                          " 'crweno5z', 'crweno5yc', 'crweno5ns','mp5', " //   &
-                          " 'mp7', 'crmp5', 'crmp5ld', 'crmp7', 'gp', 'mgp'."
+        write(error_unit,"('[', a, ']: ', a)") trim(loc),                      &
+                         "The selected reconstruction method is not "    //    &
+                         "implemented: " // trim(sreconstruction) // "." //    &
+                         "Available methods: 'tvd' 'limo3', 'ppm',"      //    &
+                         " 'weno3', 'weno5z', 'weno5yc', 'weno5ns',"     //    &
+                         " 'crweno5z', 'crweno5yc', 'crweno5ns','mp5', " //    &
+                         " 'mp7', 'mp9', 'crmp5', 'crmp5ld', 'crmp7', 'gp', 'mgp'."
       end if
       status = 1