diff --git a/simulate/simulate.cc b/simulate/simulate.cc
index 0459f1db..855a450d 100644
--- a/simulate/simulate.cc
+++ b/simulate/simulate.cc
@@ -703,7 +703,11 @@ void makerendering(mj::Simulate* sim, int oldstate) {
       }
 
     // set shortcut and data
-    mju::sprintf_arr(defFlag[0].other, " %s", mjVISSTRING[i][2]);
+    if (mjVISSTRING[i][2][0]) {
+      mju::sprintf_arr(defFlag[0].other, " %s", mjVISSTRING[i][2]);
+    } else {
+      mju::sprintf_arr(defFlag[0].other, "");
+    }
     defFlag[0].pdata = sim->vopt.flags + i;
     mjui_add(&sim->ui0, defFlag);
   }
@@ -712,6 +716,8 @@ void makerendering(mj::Simulate* sim, int oldstate) {
     mju::strcpy_arr(defFlag[0].name, mjRNDSTRING[i][0]);
     if (mjRNDSTRING[i][2][0]) {
       mju::sprintf_arr(defFlag[0].other, " %s", mjRNDSTRING[i][2]);
+    } else {
+      mju::sprintf_arr(defFlag[0].other, "");
     }
     defFlag[0].pdata = sim->scn.flags + i;
     mjui_add(&sim->ui0, defFlag);
diff --git a/src/ui/ui_main.c b/src/ui/ui_main.c
index b101bc3f..7c69f780 100644
--- a/src/ui/ui_main.c
+++ b/src/ui/ui_main.c
@@ -1027,7 +1027,7 @@ static void setcursor(mjrRect r, mjUI* ui, const mjuiState* ins, const mjrContex
 
 // parse modifier and shortcut
 static void parseshortcut(const char* text, int* mod, int* key) {
-  // cleear
+  // clear
   *mod = 0;
   *key = 0;