'How to prevent: "UserWarning: Boolean Series key will be reindexed to match DataFrame index" [duplicate]

I am having some issues with my Python code. When working with DataFrames I get a UserWarning and I'm not really sure of how to prevent it.

for index in matplatsID:
      mask = (kameraData["Tid"].dt.hour >= timme) & (kameraData["Tid"].dt.hour < timme+1)
      matplatsSummaHastigheter += kameraData[mask][kameraData["MätplatsID"] == index]["Hastighet"].sum()
      matplatsAntalFordon += kameraData[mask][kameraData["MätplatsID"] == index]["Hastighet"].count()

UserWarning: Boolean Series key will be reindexed to match DataFrame index.
  matplatsSummaHastigheter += kameraData[mask][kameraData["MätplatsID"] == index]["Hastighet"].sum()
UserWarning: Boolean Series key will be reindexed to match DataFrame index.
  matplatsAntalFordon += kameraData[mask][kameraData["MätplatsID"] == index]["Hastighet"].count()

It generates these warnings, and I am dumbfounded of how to avoid them, any ideas of what to do?

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'How to prevent: "UserWarning: Boolean Series key will be reindexed to match DataFrame index" [duplicate]

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