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Using the fixed point method, we prove some results concerning the stability of the functional equation \begin{eqnarray*} \sum^{2n}_{i=1}f(x_{i}-\frac{1}{2n}\sum^{2n}_{j=1}x_{j})=\sum^{2n}_{i=1}f(x_{i})-2n f(\frac{1}{2n}\sum^{2n}_{i=1}x_{i}) \end{eqnarray*} where $f$ is defined on a vector space and taking values in a fuzzy Banach space, which is said to be a functional equation related to a characterization of inner product spaces.

Nonlinear fuzzy stability of a functional equation related to a characterization of inner product spaces via fixed point technique