diff --git a/src/game/mario_actions_airborne.c b/src/game/mario_actions_airborne.c
index 4ee53a9fd..f31f6fa8b 100644
--- a/src/game/mario_actions_airborne.c
+++ b/src/game/mario_actions_airborne.c
@@ -546,7 +546,7 @@ s32 act_hold_jump(struct MarioState *m) {
         return drop_and_set_mario_action(m, ACT_FREEFALL, 0);
     }
 
-    if ((m->input & INPUT_B_PRESSED) && !(m->heldObj->oInteractionSubtype & INT_SUBTYPE_HOLDABLE_NPC)) {
+    if ((m->input & INPUT_B_PRESSED) && !(m->heldObj != NULL && m->heldObj->oInteractionSubtype & INT_SUBTYPE_HOLDABLE_NPC)) {
         return set_mario_action(m, ACT_AIR_THROW, 0);
     }
 
@@ -572,7 +572,7 @@ s32 act_hold_freefall(struct MarioState *m) {
         return drop_and_set_mario_action(m, ACT_FREEFALL, 0);
     }
 
-    if ((m->input & INPUT_B_PRESSED) && !(m->heldObj->oInteractionSubtype & INT_SUBTYPE_HOLDABLE_NPC)) {
+    if ((m->input & INPUT_B_PRESSED) && !(m->heldObj != NULL && m->heldObj->oInteractionSubtype & INT_SUBTYPE_HOLDABLE_NPC)) {
         return set_mario_action(m, ACT_AIR_THROW, 0);
     }
 
@@ -1065,8 +1065,10 @@ s32 act_crazy_box_bounce(struct MarioState *m) {
             if (m->actionArg < 2) {
                 set_mario_action(m, ACT_CRAZY_BOX_BOUNCE, m->actionArg + 1);
             } else {
-                m->heldObj->oInteractStatus = INT_STATUS_STOP_RIDING;
-                m->heldObj = NULL;
+                if (m->heldObj != NULL) {
+                    m->heldObj->oInteractStatus = INT_STATUS_STOP_RIDING;
+                    m->heldObj = NULL;
+                }
                 set_mario_action(m, ACT_STOMACH_SLIDE, 0);
             }
             queue_rumble_data_mario(m, 5, 80);
diff --git a/src/game/mario_actions_moving.c b/src/game/mario_actions_moving.c
index 596c04aa3..a58850cdb 100644
--- a/src/game/mario_actions_moving.c
+++ b/src/game/mario_actions_moving.c
@@ -887,7 +887,7 @@ s32 act_move_punching(struct MarioState *m) {
 }
 
 s32 act_hold_walking(struct MarioState *m) {
-    if (m->heldObj->behavior == segmented_to_virtual(bhvJumpingBox)) {
+    if (m->heldObj != NULL && m->heldObj->behavior == segmented_to_virtual(bhvJumpingBox)) {
         return set_mario_action(m, ACT_CRAZY_BOX_BOUNCE, 0);
     }
 
diff --git a/src/game/mario_actions_stationary.c b/src/game/mario_actions_stationary.c
index e39e0d9d4..c1446b0ac 100644
--- a/src/game/mario_actions_stationary.c
+++ b/src/game/mario_actions_stationary.c
@@ -65,7 +65,7 @@ s32 check_common_hold_idle_cancels(struct MarioState *m) {
         return mario_push_off_steep_floor(m, ACT_HOLD_FREEFALL, 0);
     }
 
-    if (m->heldObj->oInteractionSubtype & INT_SUBTYPE_DROP_IMMEDIATELY) {
+    if (m->heldObj != NULL && m->heldObj->oInteractionSubtype & INT_SUBTYPE_DROP_IMMEDIATELY) {
         m->heldObj->oInteractionSubtype =
             (s32)(m->heldObj->oInteractionSubtype & ~INT_SUBTYPE_DROP_IMMEDIATELY);
         return set_mario_action(m, ACT_PLACING_DOWN, 0);
@@ -448,7 +448,7 @@ s32 act_coughing(struct MarioState *m) {
 }
 
 s32 act_hold_idle(struct MarioState *m) {
-    if (segmented_to_virtual(&bhvJumpingBox) == m->heldObj->behavior) {
+    if (m->heldObj != NULL && segmented_to_virtual(&bhvJumpingBox) == m->heldObj->behavior) {
         return set_mario_action(m, ACT_CRAZY_BOX_BOUNCE, 0);
     }
 
diff --git a/src/game/mario_actions_submerged.c b/src/game/mario_actions_submerged.c
index 0fd2b8ae2..1e7229caa 100644
--- a/src/game/mario_actions_submerged.c
+++ b/src/game/mario_actions_submerged.c
@@ -750,8 +750,10 @@ static s32 act_water_shell_swimming(struct MarioState *m) {
     }
 
     if (m->actionTimer++ == 240) {
-        m->heldObj->oInteractStatus = INT_STATUS_STOP_RIDING;
-        m->heldObj = NULL;
+        if (m->heldObj != NULL) {
+            m->heldObj->oInteractStatus = INT_STATUS_STOP_RIDING;
+            m->heldObj = NULL;
+        }
         stop_shell_music();
         set_mario_action(m, ACT_FLUTTER_KICK, 0);
     }
@@ -769,6 +771,7 @@ static s32 check_water_grab(struct MarioState *m) {
     //! Heave hos have the grabbable interaction type but are not normally
     // grabbable. Since water grabbing doesn't check the appropriate input flag,
     // you can use water grab to pick up heave ho.
+    if (m->playerIndex != 0) { return FALSE; }
     if (m->marioObj->collidedObjInteractTypes & INTERACT_GRABBABLE) {
         struct Object *object = mario_get_collided_object(m, INTERACT_GRABBABLE);
         f32 dx = object->oPosX - m->pos[0];
@@ -845,7 +848,7 @@ static s32 act_water_punch(struct MarioState *m) {
         case 2:
             set_mario_animation(m, MARIO_ANIM_WATER_PICK_UP_OBJ);
             if (is_anim_at_end(m)) {
-                if (m->heldObj->behavior == segmented_to_virtual(bhvKoopaShellUnderwater)) {
+                if (m->heldObj != NULL && m->heldObj->behavior == segmented_to_virtual(bhvKoopaShellUnderwater)) {
                     play_shell_music();
                     set_mario_action(m, ACT_WATER_SHELL_SWIMMING, 0);
                 } else {