diff --git a/examples/symba_swifter_comparison/1pl_1pl_encounter/swiftest_vs_swifter.ipynb b/examples/symba_swifter_comparison/1pl_1pl_encounter/swiftest_vs_swifter.ipynb
index dc1a9992f..57dd1934a 100644
--- a/examples/symba_swifter_comparison/1pl_1pl_encounter/swiftest_vs_swifter.ipynb
+++ b/examples/symba_swifter_comparison/1pl_1pl_encounter/swiftest_vs_swifter.ipynb
@@ -43,7 +43,7 @@
      "output_type": "stream",
      "text": [
       "Reading Swiftest file param.swiftest.in\n",
-      "Reading in time 6.845e-04\n",
+      "Reading in time 1.506e-01\n",
       "Creating Dataset\n"
      ]
     },
diff --git a/src/symba/symba_encounter_check.f90 b/src/symba/symba_encounter_check.f90
index 1a9d8c68f..baa2dc5f5 100644
--- a/src/symba/symba_encounter_check.f90
+++ b/src/symba/symba_encounter_check.f90
@@ -75,6 +75,7 @@ module function symba_encounter_check_pltpenc(self, system, dt, irec) result(lan
       real(DP), dimension(NDIM) :: xr, vr
       logical                   :: lencounter, isplpl
       real(DP)                  :: rlim2, rji2
+      logical, dimension(:), allocatable :: lencmask
 
       lany_encounter = .false.
       if (self%nenc == 0) return
@@ -90,7 +91,10 @@ module function symba_encounter_check_pltpenc(self, system, dt, irec) result(lan
       class is (symba_pl)
          select type(tp => system%tp)
          class is (symba_tp)
-            do concurrent(i = 1:self%nenc, self%status(i) == ACTIVE .and. self%level(i) == irec - 1)
+            allocate(lencmask(self%nenc))
+            lencmask(:) = (self%status(1:self%nenc) == ACTIVE) .and. (self%level(:) == irec - 1)
+            if (.not.any(lencmask(:))) return 
+            do concurrent(i = 1:self%nenc, lencmask(i))
                associate(index_i => self%index1(i), index_j => self%index2(i))
                   if (isplpl) then
                      xr(:) = pl%xh(:,index_j) - pl%xh(:,index_i)