Executing SoftBody::remove_collision_exception_with, crashes Godot

[qarmin]

Godot version:
3.2.4.rc.custom_build. bc2d960

Issue description:
Executing this code

var q_SoftBody : SoftBody = SoftBody.new()

func _ready() -> void:
	add_child(q_SoftBody)

func _process(_delta : float) -> void:
	if randi() % 10 == 0:
		q_SoftBody.queue_free()
		q_SoftBody = SoftBody.new()
		add_child(q_SoftBody)

	modify_object(q_SoftBody)

static func modify_object(q_SoftBody : SoftBody) -> void:
	if randi() % 2 == 0:
		print("Executing SoftBody.remove_collision_exception_with")
		var p_object_0 = RigidBody.new()
		q_SoftBody.remove_collision_exception_with(p_object_0)
		p_object_0.queue_free()

crashes Godot with this thisbacktrace

scene/gui/tree.cpp:1011:31: runtime error: member access within null pointer of type 'struct TreeItem'
handle_crash: Program crashed with signal 11
modules/bullet/collision_object_bullet.cpp:159:46: runtime error: member call on null pointer of type 'struct btCollisionObject'
modules/bullet/collision_object_bullet.cpp:159:46: runtime error: member access within null pointer of type 'struct btCollisionObject'
handle_crash: Program crashed with signal 11
Dumping the backtrace. Please include this when reporting the bug on https://github.com/godotengine/godot/issues
[1] godots() [0x171868e] (/home/rafal/Pulpit/godot3.2/platform/x11/crash_handler_x11.cpp:54)
[2] /lib/x86_64-linux-gnu/libc.so.6(+0x46210) [0x7f1ddfc59210] (??:0)
[3] CollisionObjectBullet::remove_collision_exception(CollisionObjectBullet const*) (/home/rafal/Pulpit/godot3.2/modules/bullet/collision_object_bullet.cpp:159 (discriminator 2))
[4] BulletPhysicsServer::soft_body_remove_collision_exception(RID, RID) (/home/rafal/Pulpit/godot3.2/modules/bullet/bullet_physics_server.cpp:974)
[5] SoftBody::remove_collision_exception_with(Node*) (/home/rafal/Pulpit/godot3.2/scene/3d/soft_body.cpp:595)
[6] MethodBind1<Node*>::call(Object*, Variant const**, int, Variant::CallError&) (/home/rafal/Pulpit/godot3.2/./core/method_bind.gen.inc:775 (discriminator 12))
[7] Object::call(StringName const&, Variant const**, int, Variant::CallError&) (/home/rafal/Pulpit/godot3.2/core/object.cpp:919 (discriminator 1))
[8] Variant::call_ptr(StringName const&, Variant const**, int, Variant*, Variant::CallError&) (/home/rafal/Pulpit/godot3.2/core/variant_call.cpp:1130 (discriminator 1))
[9] GDScriptFunction::call(GDScriptInstance*, Variant const**, int, Variant::CallError&, GDScriptFunction::CallState*) (/home/rafal/Pulpit/godot3.2/modules/gdscript/gdscript_function.cpp:1089)
[10] GDScriptInstance::call(StringName const&, Variant const**, int, Variant::CallError&) (/home/rafal/Pulpit/godot3.2/modules/gdscript/gdscript.cpp:1208)
[11] Object::call(StringName const&, Variant const**, int, Variant::CallError&) (/home/rafal/Pulpit/godot3.2/core/object.cpp:898 (discriminator 1))
[12] Variant::call_ptr(StringName const&, Variant const**, int, Variant*, Variant::CallError&) (/home/rafal/Pulpit/godot3.2/core/variant_call.cpp:1130 (discriminator 1))
[13] GDScriptFunction::call(GDScriptInstance*, Variant const**, int, Variant::CallError&, GDScriptFunction::CallState*) (/home/rafal/Pulpit/godot3.2/modules/gdscript/gdscript_function.cpp:1089)
[14] GDScriptInstance::call_multilevel(StringName const&, Variant const**, int) (/home/rafal/Pulpit/godot3.2/modules/gdscript/gdscript.cpp:1224)
[15] Node::_notification(int) (/home/rafal/Pulpit/godot3.2/scene/main/node.cpp:58)
[16] Node::_notificationv(int, bool) (/home/rafal/Pulpit/godot3.2/./scene/main/node.h:46 (discriminator 14))
[17] CanvasItem::_notificationv(int, bool) (/home/rafal/Pulpit/godot3.2/./scene/2d/canvas_item.h:166 (discriminator 3))
[18] Node2D::_notificationv(int, bool) (/home/rafal/Pulpit/godot3.2/./scene/2d/node_2d.h:38 (discriminator 3))
[19] Object::notification(int, bool) (/home/rafal/Pulpit/godot3.2/core/object.cpp:931)
[20] SceneTree::_notify_group_pause(StringName const&, int) (/home/rafal/Pulpit/godot3.2/scene/main/scene_tree.cpp:988)
[21] SceneTree::idle(float) (/home/rafal/Pulpit/godot3.2/scene/main/scene_tree.cpp:528 (discriminator 3))
[22] Main::iteration() (/home/rafal/Pulpit/godot3.2/main/main.cpp:2115)
[23] OS_X11::run() (/home/rafal/Pulpit/godot3.2/platform/x11/os_x11.cpp:3628)
[24] godots(main+0x334) [0x170f07a] (/home/rafal/Pulpit/godot3.2/platform/x11/godot_x11.cpp:57)
[25] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f1ddfc3a0b3] (??:0)
[26] godots(_start+0x2e) [0x170ec8e] (??:?)