Divide by 0 Error
What does it mean
This error signifies an arithmetic exception that occurs when your code attempts to perform a division operation where the divisor (the number you are dividing by) is zero.
It means the mathematical operation is undefined at the point it was attempted.
Solution
Locate the specific line of code where the division operation is taking place by reviewing debug logs or the error stack trace.
Examine the variable or expression being used as the divisor immediately preceding the division.
Implement a conditional check (if (divisorVariable != 0)) before performing the division to ensure the divisor is not zero.
Define how the code should behave when the divisor is zero; options include skipping the calculation, assigning a default value to the result, or throwing a custom exception with a meaningful message.
Ensure that any formulas or calculations leading to the divisor's value are reviewed to prevent it from becoming zero unintentionally.
Why it happened
The error is a direct result of attempting a division operation where the denominator's value was zero.
In Apex and most programming languages, division by zero is an undefined mathematical operation and triggers a System.MathException.
This typically occurs because a variable intended for use as a divisor was not properly initialized, was assigned a value of zero through previous calculations, or received zero from external data without a check.