Error putting anim :Stop()?

Help and Feedback Scripting Support
1

Well, my problem is that sometimes it works and sometimes the anim: Stop () doesn’t and I really don’t know how to fix it.
Edit: I have noticed that the errors gives us when you are not moving, after moving it will not give the errors.
Line 36

local uis = game:GetService("UserInputService")
local crawlAnimation = script:WaitForChild("Crawl")
local loadedCrawlAnim
local crawlIdle = script:WaitForChild("CrawlIdle")
local loadedIdleAnim
local isCrawling = false
local humanoid = script.Parent:FindFirstChild("Humanoid")

local KeyText = "C"

uis.InputBegan:Connect(function(key, gameProcessed)

	if key.KeyCode.Name == KeyText then
		if isCrawling then
			isCrawling = false  
			if loadedCrawlAnim then loadedCrawlAnim:Stop() end  
			loadedIdleAnim:Stop()           


		elseif not isCrawling then
			isCrawling = true   
			loadedIdleAnim = humanoid:LoadAnimation(crawlIdle)
			loadedIdleAnim:Play()
		end
	end 
end)


game:GetService("RunService").RenderStepped:Connect(function()

	if not isCrawling then return end
	if humanoid.MoveDirection.Magnitude > 0 then
		if not loadedCrawlAnim then loadedCrawlAnim = humanoid:LoadAnimation(crawlAnimation) end
		if loadedCrawlAnim.IsPlaying == false then loadedCrawlAnim:Play() end   
	else
		loadedCrawlAnim:Stop()
		loadedIdleAnim:Play()
	end
end)
2

Im a little late to the party, but I think this should work:

local uis = game:GetService("UserInputService")
local crawlAnimation = script:WaitForChild("Crawl")
local loadedCrawlAnim
local crawlLoaded = false
local crawlIdle = script:WaitForChild("CrawlIdle")
local loadedIdleAnim
local isCrawling = false
local humanoid = script.Parent:FindFirstChild("Humanoid")

local KeyText = "C"

uis.InputBegan:Connect(function(key, gameProcessed)

	if key.KeyCode.Name == KeyText then
		if isCrawling then
			isCrawling = false  
			if crawlLoaded then
			   loadedIdleAnim:Stop()   
               crawlLoaded = false
            end        


		elseif not isCrawling then
			isCrawling = true   
            if not crawlLoaded then
		       loadedIdleAnim = humanoid:LoadAnimation(crawlIdle)
			   loadedIdleAnim:Play()
               crawlLoaded = true
            end
		end
	end 
end)


game:GetService("RunService").RenderStepped:Connect(function()

	if not isCrawling then return end
	if humanoid.MoveDirection.Magnitude > 0 then
		if not crawlLoaded then loadedCrawlAnim = humanoid:LoadAnimation(crawlAnimation) end
		if loadedCrawlAnim.IsPlaying == false then loadedCrawlAnim:Play() end   
	else
		loadedCrawlAnim:Stop()
		loadedIdleAnim:Play()
	end
end)