Broad iron lines are expected, and observed, to be a widespread feature in bright AGN. However, a significant fraction of object misses a disk line component. We extracted from the sample of all Seyfert 1 galaxies the ones with no detection of a broad Fe Kα line, to investigate the physical cause of this absence. We analysed all archival Suzaku observations that, thanks to the broad energy band, allows us to investigate the connection between broad Fe Kα line and reflection continuum. Our analysis shows that relativistic FeKα line are ubiquitous features in the spectra of Seyfert galaxies, but are often difficult to detect without very high quality data. We also investigate the relation between the Fe Kα line and the reflection continuum. For most of the sample, the strength of the reflection component is consistent with that of the line.