Solipsism (from Latin solus, meaning 'alone', and ipse, meaning 'self') is the philosophical idea that only one's mind is sure to exist. As an epistemological position, solipsism holds that knowledge of anything outside one's own mind is unsure; the external world and other minds cannot be known and might not exist outside the mind.
Every idea or claim must be assessed by its origin and compatibility with the basic logical and rational principles. The claim of solipsism is based on a doubt created by person or persons who try to run away from the realities of life to claim doubt. They doubts their own existence and the existence of others. How can we accept a claim from persons who doubt their own existence?
Simply, we don't believe in any claim or philosophy which is not based on the true realities of life. All realities of life are mentioned in Quran and Hadeeths and any things goes against these realities can never be accepted.
Philosophy is a way of thinking which needs to be guided by the facts of life best known by The Creator of Life, and not just by the imaginations. Unguided philosophy misleads, while philosophy guided by Allah's messages leads to the Truth.