Sentry - runtime.boundsError: runtime error: index out of range [0] with length 0

Open Beginner friendly

#411 opened on Aug 4, 2026 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 2/5
Estimated time: 1-3 hours
Newbie friendliness: 68/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Quiet
Tech stack: go
Domain: api, backend

Research direction

Start by reproducing the request to /section/000000000000000000000000/course, then inspect api/controllers/section.go around sectionCourse at line 203 and SectionCourseById at line 168. Trace why the request reaches an empty value and verify that it no longer produces the reported runtime bounds error.

Written by the indexing model from the issue text.

Description

bug report good first issue L1

Sentry Issue: API-3J

runtime.boundsError: runtime error: index out of range [0] with length 0
  File "github.com/UTDNebula/nebula-api/api/controllers/section.go", line 203, in sectionCourse
  File "github.com/UTDNebula/nebula-api/api/controllers/section.go", line 168, in SectionCourseById
  File "github.com/gin-gonic/gin@v1.10.1/context.go", line 185, in (*Context).Next
  File "github.com/gin-gonic/gin@v1.10.1/context.go", line 185, in (*Context).Next
  File "github.com/UTDNebula/nebula-api/api/server.go", line 118, in LogRequest
...
(7 additional frame(s) were not displayed)

This is the HTTP Request that caused this issue

curl \
 -H "Connection: close" \
 -H "Host: 127.0.0.1:8080" \
 "http://127.0.0.1:8080/section/000000000000000000000000/course"

Dominant language: Go
Stars: 39
Forks: 94
Avg merge: 10h 43m
Merged PRs (30d): 5

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