Hi,

I am facing some problems on SymPy Live. I tried executing the example 
session on live.sympy.org and the following error was thrown,

```
>>> expr = (x + y)**5
Traceback (most recent call last): File "<string>", line 1, in <module> 
File 
"/base/data/home/apps/s~sympy-live-hrd/20200105t193609.423659059328302322/sympy/sympy/core/decorators.py",
 
line 91, in __sympifyit_wrapper return func(a, b) File 
"/base/data/home/apps/s~sympy-live-hrd/20200105t193609.423659059328302322/sympy/sympy/core/decorators.py",
 
line 129, in binary_op_wrapper return func(self, other) File 
"/base/data/home/apps/s~sympy-live-hrd/20200105t193609.423659059328302322/sympy/sympy/core/expr.py",
 
line 176, in __add__ return Add(self, other) File 
"/base/data/home/apps/s~sympy-live-hrd/20200105t193609.423659059328302322/sympy/sympy/core/cache.py",
 
line 94, in wrapper retval = cfunc(*args, **kwargs) File 
"/base/data/home/apps/s~sympy-live-hrd/20200105t193609.423659059328302322/sympy/sympy/core/compatibility.py",
 
line 916, in wrapper del cache[oldkey] KeyError: [<class 
'sympy.core.add.Add'>, x, y, <class 
'sympy.core.assumptions.ManagedProperties'>, <class 
'sympy.core.symbol.Symbol'>, <class 'sympy.core.symbol.Symbol'>]
```
Can someone help me with this? 
Thank you.

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